Prisons & Fortresses
Spain
January 28, 2026
11 minutes

Montjuïc Castle: The Fortress That Bombed Its Own City

Explore the dark history of Montjuïc Castle, the Barcelona fortress where thousands were tortured and executed during the Spanish Civil War and Franco’s dictatorship. Learn about the mass graves, the execution of Catalan President Lluís Companys, and the castle’s role as a symbol of political repression.

Montjuïc Castle is a massive star-shaped military fortification perched atop Montjuïc hill, commanding a strategic vantage point over the harbor and urban grid of Barcelona. It is infamous as the primary battery used to shell the civilian population of Barcelona and as the site of the 1940 execution of Catalan President Lluís Companys.

The Ascent to the Kill Zone

The journey to the summit of Montjuïc often begins with a deception. Most modern visitors arrive via the Teleféric de Montjuïc, a gleaming cable car that swings gently over the tree canopy, offering a bird’s-eye view of the Mediterranean’s azure expanse. Inside the glass cabins, tourists jostle for the perfect angle, capturing selfies against the backdrop of the shimmering port and the cruise ships docked like sleeping giants. The sun is usually bright, the air salty and fresh. It feels like a holiday.

But as the cabin docks at the upper station and you step onto the dusty gravel of the summit, the atmosphere shifts. The heat seems to radiate not from the sky, but from the pale, monolithic stones rising before you. This is not a palace, nor is it merely a defensive outpost. The geometry is too sharp, the walls too thick, the silence too heavy. You have arrived at the Castell de Montjuïc.

From the base of the ramparts, the city of Barcelona spreads out below in a dense, chaotic tapestry. It is a breathtaking vista, but to understand this place, you must suppress the urge to admire the view and instead adopt the mindset of the architects who built it. They did not design this vantage point to watch the sunrise. They designed it to establish a firing solution. For three centuries, the cannons resting on these walls were not primarily aimed at foreign navies approaching from the sea; they were aimed, with lethal precision, at the rooftops, markets, and squares of the city below. This is a fortress built to hold a population hostage.

The Hill of the Dead

The darkness of Montjuïc predates the first stone of the current fortress. The name itself, Montjuïc, is a linguistic fossil of the hill’s original purpose: "Mountain of the Jews" (Mons Iudaeis in Medieval Latin). In the Middle Ages, the Jewish community of Barcelona—segregated in the Call (the Jewish Quarter) inside the city walls—was forbidden from burying their dead within the consecrated ground of the Christian city. Instead, they were forced to haul their deceased up the steep, scrubby slopes of this hill overlooking the sea.

For centuries, this windswept summit was a place of rest, a necropolis of Hebrew inscriptions and silence. However, the strategic value of the height eventually outweighed the sanctity of the graves. When the initial fortifications were expanded in the 17th century, and later completely overhauled in the 18th, the cemetery was not merely relocated; it was obliterated.

Historical accounts and archaeological evidence suggest a profound desecration. Jewish gravestones were uprooted and cannibalized, used as fill and foundation for the rising military structures. The fortress that stands today literally rests on the bones of Barcelona’s persecuted minority. This act of erasure set a grim precedent for the hill: a place where the humanity of the marginalized was crushed beneath the weight of state power.

A Stone Collar for a Rebellious City

The castle took its current, menacing star-shaped form in the wake of the War of the Spanish Succession (1701–1714). When Barcelona fell to the Bourbon troops of Philip V on September 11, 1714, after a brutal 14-month siege, the Catalan institutions were abolished, and the city was placed under martial law. The new monarch needed to ensure that the rebellious Catalans would never rise again.

His solution was architectural strangulation. To the east of the city, he demolished a massive residential district (La Ribera) to build the Ciutadella, a massive star fort. To the south, he expanded Montjuïc. Barcelona was thus caught in a pincer, squeezed between two massive military complexes.

The engineer Juan Martín Cermeño, who finalized the castle’s design in the mid-18th century, created a masterpiece of military engineering, but its orientation was telling. The bastions were configured to dominate the city streets. The fortress became a symbol of the Bourbon centralist boot on the neck of Catalonia. It was a stone collar, tight and choking, reminding every citizen who looked up at the skyline that their conquerors were watching.

The Guns Pointed Inward

It is a rare indignity for a city to be bombarded by its own citadel, yet for Barcelona, it became a recurring nightmare. The defining trauma of this relationship occurred in 1842. Following a popular uprising against the regent Baldomero Espartero, the Spanish army retreated to the safety of Montjuïc’s heights.

Rather than negotiate or engage in street fighting, General Espartero ordered the cannons to open fire on the civilian population. On December 3, 1842, over 1,000 projectiles rained down on Barcelona from the castle. Fires swept through the Old City; the Town Hall was damaged, and panic gripped the streets. The bombardment lasted for hours, a indiscriminate punishment intended to terrorize.

It was in the aftermath of this atrocity that Espartero is attributed with the chilling maxim that has haunted Spanish politics for nearly two centuries: "For the good of Spain, Barcelona must be bombarded at least once every fifty years." This was not hyperbole; it was doctrine. The castle was the instrument of that doctrine, a weaponized extension of the state turned against its own people.

The Descent into Hell: 1896

By the late 19th century, Barcelona had become known as the "Rose of Fire," a hotbed of anarchism and labor unrest. The tensions between the destitute working class and the wealthy bourgeoisie reached a breaking point on June 7, 1896, when a bomb was thrown at the Corpus Christi procession on Carrer dels Canvis Nous, killing twelve people.

The response from the state was a blind, flailing rage. Police swept through the city, arresting hundreds of anarchists, teachers, republicans, and anticlericals, regardless of evidence. These prisoners were dragged up the hill to Montjuïc, which was about to transform from a military garrison into a torture chamber.

The "Montjuïc Trials" (Proceso de Montjuïc) that followed were a farce of justice, but they remain legendary for the sheer sadism unleashed within the castle walls. The military prosecutors needed confessions to justify the mass arrests, and they were willing to break bodies to get them. The dungeons of Montjuïc, damp and dark, became a laboratory of pain.

Screams Behind the Stone

The specific details of the torture inflicted in 1896 are difficult to read, yet necessary to understand the psychic weight of the castle. Survivors and international journalists later documented the methods used by the Civil Guard lieutenants inside the fortress.

Prisoners were subjected to the "helmets," a device that squeezed the head, crushing the temples. Others had their fingernails ripped out or were hung from the ceiling by their genitals. A particularly cruel method involved forcing prisoners to walk continuously for days without sleep or food; if they stopped, they were whipped. They were fed dried fish but denied water, driving them to a delirium of thirst.

Tongues were lacerated; flesh was burned. The goal was not truth, but the extraction of names—any names. Under this duress, innocent men implicated others, widening the net of repression. The screams echoed off the stone vaults, unheard by the city below. Five men were eventually executed by firing squad in the castle moat, and dozens were sent to penal colonies, but the stain of the torture scandal turned Montjuïc into an international symbol of Spanish barbarism.

The Powder Keg Ignites

The repression did not quell the unrest; it poured gasoline on it. In 1909, the castle was once again the focal point of tragedy during the "Tragic Week" (Setmana Tràgica). Following a workers' revolt against conscription for the colonial war in Morocco, the army cracked down with lethal force.

The castle’s dungeons filled again. Among the prisoners was Francesc Ferrer i Guàrdia, a pedagogue and founder of the Modern School (Escuela Moderna), which promoted secular, rationalist education. Despite a total lack of evidence linking him to the violence, the military tribunal at Montjuïc needed a scapegoat. Ferrer was accused of being the mastermind of the riots.

On October 13, 1909, Ferrer was led into the Santa Amàlia ditch of the castle. He refused a blindfold, facing the firing squad with eyes open. His execution sparked protests across Europe, from Paris to London, cementing Montjuïc’s reputation as the altar upon which free thought was sacrificed.

The Red Terror on the Hill

When the Spanish Civil War erupted in July 1936, the dynamic of the castle flipped, but the violence remained. The Republican forces and anarchist militias that took control of Barcelona seized the fortress. For the first time, the guns were not pointed at the workers, but the walls still held prisoners.

During the chaotic early months of the war, the castle became a prison for right-wing sympathizers, Falangists, rebel officers, and clergy. The "Red Terror" saw the fortress used as a site of extrajudicial execution and imprisonment by the antifascist committees. It is a historical truth that the stones of Montjuïc are stained with blood from all sides of the political spectrum. The violence was systemic; the location was merely the most convenient vessel for it. However, what was to come in 1939 would dwarf the Republican repression in scale and systematic cruelty.

The White Terror and the Purge

On January 26, 1939, Barcelona fell. The Nationalist troops of General Francisco Franco marched into the city, and the Republican flag was lowered from the castle mast for the last time. The "White Terror" began immediately.

Montjuïc was transformed into a processing center for the systematic elimination of the "anti-Spain." The castle was overflowing. Between 1939 and 1952, thousands of Republicans, Catalanists, trade unionists, and intellectuals were imprisoned here. The military courts operated on an assembly-line basis. Trials lasted minutes. Sentences were predetermined.

Every morning, the firing squads assembled in the Santa Eulàlia moat. The thud of volleys became a grim clock for the prisoners waiting in the cells. It is estimated that nearly 4,000 people were executed in Barcelona during the post-war repression, with Montjuïc serving as the primary theater of death.

The President in Chains

Of all the ghosts that walk the ramparts of Montjuïc, none is more significant than Lluís Companys. He was the President of the Generalitat de Catalunya (the Catalan government) during the Civil War. After the Republican defeat, he fled to France, living in exile.

However, the reach of fascism was continental. In 1940, the German Gestapo arrested Companys in Brittany and handed him over to Franco’s agents. He was not treated as a head of state or a prisoner of war; he was treated as a traitor and a trophy. He was transported to Madrid, tortured, and then brought to Montjuïc Castle.

The regime wanted to make an example of him. They wanted to show that Catalan self-determination was not just defeated, but criminalized. His trial lasted less than an hour. The verdict was death.

The President’s Last Walk

The morning of October 15, 1940, was cool and damp. Before the sun had fully risen over the Mediterranean, Lluís Companys was led from his cell. He was 58 years old. He asked to be allowed to take off his shoes, stating that he wanted to die with his feet touching the soil of his country.

He was marched to the Santa Eulàlia moat, a long, high-walled defensive trench on the landward side of the castle. The firing squad of the Civil Guard waited. A priest offered him a blindfold, but Companys refused. He wanted to look his executioners in the eye.

As the soldiers raised their rifles, the President of Catalonia shouted his final words, which still echo in the Catalan consciousness: "Per Catalunya!" (For Catalonia!). The volley cut him down.

He remains the only democratically elected president in European history to be executed by fascism. His body was dumped in a common grave at the nearby cemetery, though later recovered. His execution consecrated the moat as holy ground for Catalan nationalism—a wound that the dictatorship tried to cover up, but could never heal.

The Museum of Victory

Following the war, the Franco regime sought to solidify its psychological hold on Barcelona. In 1963, Franco inaugurated a Military Museum within the castle. It was a masterstroke of humiliation: the site of the city's torture was rebranded as a celebration of the army that had inflicted it.

For decades, schoolchildren were bussed up the hill to view collections of muskets, swords, and tin soldiers, walking unknowingly over the spots where political prisoners had been murdered. In the center of the parade ground, a massive equestrian statue of Franco was erected. He sat high on his horse, gazing toward the city he had conquered.

This "Museum of Victory" held the city in a chokehold of memory. It forced the defeated to celebrate the victor. It normalized the fortress, turning it into a benign tourist attraction while burying its true history under glass display cases of medals and uniforms.

Removing the General’s Shadow

The transition to democracy in Spain following Franco’s death in 1975 was slow and fragile. It took decades for Montjuïc to be wrestled from the hands of the military. It wasn't until 2007 that the castle was fully transferred to the Barcelona City Council.

The process of reclamation was symbolic and physical. The equestrian statue of Franco—one of the last remaining in Spain—was removed, decapitated, and placed in storage (it was later briefly displayed in a controversial exhibition, headless). The Military Museum was dismantled. The city began the painful process of scrubbing the fascist glory from the walls to reveal the historical scars underneath.

The Moat of Silence

To visit Montjuïc today is to walk a line between leisure and horror. The most visceral experience is found in the Santa Eulàlia moat—the "Walk of the Condemned."

Accessing the moat, the noise of the city vanishes, cut off by the massive stone retaining walls. The ground is now covered in manicured grass and gravel. Part of it is used, jarringly, as an archery range. But if you walk to the corner near the bastion, you will find the memorial to Lluís Companys.

It is a simple monument, but the atmosphere is crushing. This is the killing ground. The sunlight struggles to reach the bottom of the trench until midday. Standing here, the silence feels artificial, as if the air itself is holding its breath. It is a "Moat of Silence," where the imagination inevitably fills the void with the sounds of the bolt-action rifles and the thud of bodies hitting the dirt. It requires a strong constitution to linger here and acknowledge that this garden was, for years, an abattoir.

Targeting the City

Climbing to the upper ramparts offers the famous 360-degree view. This is where the tourists take their panoramic photos. But to truly see the castle, you must look through the embrasures—the gaps in the wall designed for cannons.

From here, the layout of Barcelona is laid out like a map. You can identify the spires of the Sagrada Família, the grid of the Eixample, and the bustle of the Ramblas. But notice the angle. The geometry of the walls draws your eye naturally to the city center.

Stand next to the remaining massive coastal defense guns. They are rusted giants, immovable and cold. While some point to sea, the design of the bastions allowed for overlapping fields of fire inward. This view is not a landscape; it is a target acquisition grid. The beauty of the Mediterranean backdrop—the glittering water, the ferries—contrasts violently with the realization that you are standing in the sniper’s nest.

Voices in the Stone

While much of the interior has been renovated for exhibitions, traces of the prison remain. In the lower levels and the casemates, the air is dank. During the restoration and historical surveys, researchers documented the graffiti scratched into the walls by prisoners awaiting trial or execution.

These "Voices in the Stone" are faint, often just initials, dates, or calendar tallies marking the days of survival. Some are anarchist symbols; others are simple messages of goodbye to mothers or lovers. These scratches are the only testament left for thousands of nameless individuals who passed through the "Castell." Visiting these confined spaces induces a claustrophobia that the open sky of the ramparts cannot cure. It is the feeling of being buried alive, forgotten by the world just a few hundred meters down the hill.

Cinema on the Killing Ground

In a supreme act of reclamation—or perhaps cognitive dissonance—the castle grounds now host the "Sala Montjuïc" every summer. It is an open-air cinema festival. Thousands of locals and tourists haul picnic blankets, wine, and cheese up the hill to sit on the grass of the moat and watch classic films and blockbusters projected onto the castle walls.

There is a surreal, almost macabre quality to this. People laugh at a Woody Allen comedy or tap their feet to a jazz band on the exact spot where firing squads operated. Is it a triumph of life over death? Is it a profound disrespect? Or is it simply the way a city heals—by layering new memories over the old until the blood is no longer visible?

Walking through the crowd at dusk, with the smell of popcorn mixing with the sea breeze, one cannot help but wonder if the ghosts of 1940 are watching from the ramparts, confused by the music.

The Scar That Does Not Fade

Montjuïc Castle is a paradox. It is one of the best places to watch the sunset in Barcelona, yet it is a place where the sun set on democracy for forty years. It is a lush parkland that covers a mass grave.

The city has done an admirable job of contextualizing the site in recent years, turning it into a center for peace and memory. But the castle remains a scar on the skyline. It is a dark, heavy shape that looms over the vibrant, colorful life of Barcelona.

To visit Montjuïc is to bear witness. It is not enough to take the selfie and leave. One must walk the moat, touch the cold stone, and acknowledge the historical weight of the place. The beauty of Barcelona is undeniable, but it is a beauty that has survived despite this fortress, not because of it. The castle stands as a permanent warning: the guns can always be turned inward.

FAQ

Is Montjuic Castle open to the public for tours?

Yes, the castle is currently managed by the Barcelona City Council and is open to visitors year-round, except for major holidays like Christmas and New Year’s Day. Visitors can explore the parade grounds, the terrace with its panoramic views of the Mediterranean, and the various rooms that house permanent and temporary exhibitions regarding the fortress's military history. Tickets can be purchased on-site or online, with reduced rates available for students and seniors.

Why is Montjuïc Castle known as a weapon against Barcelona rather than a defense?

Unlike traditional fortresses built to protect a city from foreign invaders, Montjuïc was historically utilized by the Spanish monarchy and the Francoist regime to subjugate the local population. From its heights, the military could exert total "panoptic" control over the grid of the city. Most infamously, it served as the primary battery for the 1842 and 1843 bombardments of Barcelona, where cannons were turned inward to shell civilian neighborhoods into submission, cementing its legacy as a symbol of centralist tyranny over Catalan autonomy.

What took place in the Fossar de la Pedrera and the castle moats?

The moats of Montjuïc Castle, particularly the Santa Eulàlia moat, served as the primary execution grounds for the Francoist regime following the Spanish Civil War. The nearby Fossar de la Pedrera (Quarry Cemetery) became a mass grave for over 4,000 people executed between 1939 and 1952. These individuals, labeled as "enemies of the state," were often brought to the castle for summary court-martials before being faced with a firing squad in the early hours of the morning.

Which high-profile political figures were imprisoned or executed at Montjuïc?

The most significant figure executed at the site was Lluís Companys, the democratically elected President of the Generalitat of Catalonia. After being captured by the Gestapo in occupied France and handed over to Franco’s agents, he was tortured and eventually shot at the castle on October 15, 1940. His death turned the castle into a sacred site of Catalan martyrdom. Other prisoners included thousands of anarchists, labor union leaders, and intellectuals who were held in the damp, subterranean cells during the "White Terror."

How did the 19th-century bombardments of Barcelona change the city's geography?

The shelling from Montjuïc in 1842, ordered by General Espartero, destroyed hundreds of buildings and killed dozens of civilians to quell a popular uprising. This event, and the subsequent 1843 bombardment, proved that the medieval walls of Barcelona were no longer a defense but a cage. This trauma was a primary catalyst for the eventual "Cerdà Plan" and the demolition of the city walls, as the population realized that the proximity of the fortress made the old city a death trap under the castle’s vertical fire.

Is the "Torture Museum" at Montjuïc Castle historically accurate?

While the castle once housed a military museum that included various instruments of war, it has recently undergone a de-politicization process to focus on its role as a "Center for Peace." However, the dark tourism appeal remains in the preserved "Cell 11" and the grim atmosphere of the prison wings. Modern historians point out that the true "torture" was not via medieval devices, but through systemic psychological and physical abuse within the 20th-century military prison system, which remained active as a disciplinary center until well into the 1960s.

Sources & References

  1. Castell de Montjuïc Official Website (Barcelona City Council)
  2. Lluís Companys: Biography and Execution (Generalitat de Catalunya)
  3. The Bombardment of Barcelona 1842 (Enciclopèdia Catalana)
  4. Montjuïc Trial (1896) Historical Context
  5. EUROM (European Observatory on Memories) - Montjuïc Castle
  6. Memorial Democràtic (Government of Catalonia)
  7. Sala Montjuïc (Outdoor Cinema History)
  8. The Tragic Week of 1909 (Don Quijote History)
  9. Association for the Recovery of Historical Memory (ARMH)
  10. Barcelona Tourism - Montjuïc History
  11. History of the Jewish Cemetery on Montjuïc
  12. El Nacional - The Removal of Franco's Statue
Share on
Author
Diego A.
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Our Latest Similar Stories

Our most recent articles related to the story you just read.