Budapest’s Former Top-Secret Hospital Inside a Cave

At the top of a hill in Budapest, overlooking the Danube River, sits Buda Castle, a gorgeous UNESCO World Heritage site visited by thousands of tourists every year. Directly underneath the castle, however, lies a less-frequented tourist attraction: a series of ancient, naturally formed caves with a colorful and sometimes disturbing history.

The entire cave system is over six miles long, and most of that has been left unchanged since it was used as cold storage (and a rumored dungeon) in the Middle Ages. Between 1939 and 2008, however, a half-mile stretch of those caves was built up and repurposed many times over. Known as Sziklakorhaz or The Hospital in the Rock, its many uses are a testament to the area’s involvement in World War II and the Cold War.

At the start of World War II, the location served as a single-room air raid center, but operating theaters, corridors, and wards were quickly added to create a much-needed hospital. By early 1944, the hospital had officially opened inside the cave, tending to wounded Hungarian and Nazi soldiers. After less than a year of operation, the facility found itself facing its largest challenge—the Siege of Budapest, which lasted seven weeks and was eventually won by Allied forces on their way to Berlin.

As one of the few area hospitals still operational, the Hospital in the Rock was well over capacity during the siege. Originally built to treat around 70 patients, close to 700 ended up crammed into the claustrophobic caves. The wounded lay three to a bed—if they were lucky enough to get a bed at all. Unsurprisingly, heat from all those bodies raised the ambient temperature to around 95°F, and smoking cigarettes was the number one way to pass the time. Add that to the putrid mix of death, decay, and infection and you’ve got an incredibly unpleasant wartime cocktail.

After the siege, the Soviets took control of the caves (and Budapest itself) and gutted the hospital of most of its supplies. Between 1945 and 1948, the hospital produced a vaccination for typhus. As the icy grasp of the Cold War began to tighten, new wards were built, new equipment was installed, and the hospital was designated top-secret by the Soviets, referred to only by its official codename LOSK 0101/1.

Eleven years after facing the horrors of the Siege of Budapest, in 1956, the hospital hosted the casualties of another battle: The Hungarian Uprising. Thousands of Hungarians revolted against the Soviet policies of the Hungarian People’s Republic in a fierce, prolonged battle. Civilians and soldiers alike lay side-by-side in wards as surgeons attempted to save them. During the uprising, seven babies were also born in the hospital.

Surgeons lived on-site and rarely surfaced from the caves. The hospital’s chief surgeon at the time, Dr. András Máthé, famously had a strict “no amputation” rule, which seemed to fly in the face of conventional wisdom, but in the end reportedly saved many patients’ lives. (Máthé also reportedly wore a bullet that he’d removed from a patient’s head on a chain around his neck.)

The Hospital in the Rock ceased normal operations in December 1956, after the Soviets squashed the uprising, as the Soviets had new plans for the caves. With the Cold War now in full swing, the still-secret site was converted into a bunker that could serve as a hospital in case of nuclear attack. Diesel engines and an air conditioning system were added in the early ’60s, so that even during a blackout, the hospital could still function for a couple of days.

The official plan for the bunker was as follows: In the event of a nuclear attack, a selection of doctors and nurses would retreat to the bunker, where they would remain for 72 hours. Afterward, they were to go out and search for survivors. Special quarantined rooms, showering facilities, and even a barbershop were on site for survivors brought back to the site. (The only haircut available to them, however, was a shaved head; radioactive material is notoriously difficult to remove from hair.)

Thankfully, none of these nuclear procedures were ever put into practice. But the hospital was never formally decommissioned, and it wasn’t relieved of its top-secret status until the mid-2000s. For a while, it was still being used as a storage facility by Hungary’s Civil Defense Force. The bunker was maintained by a nearby family, who were sworn to secrecy. In 2004, it was decided that responsibility for the site fell solely on St. John’s Hospital in Budapest, who were seen as the de facto owners in the wake of the collapse of the Soviet Union.

By 2008 the bunker was renovated, refurbished, and ready to be opened to the public. Today it operates as a museum, with exhibits detailing life in the hospital from various periods of its history, as well as the history of combat medicine as a whole. The sobering hour-long walk around the hospital concludes with a cautionary gaze into the atrocities of nuclear attacks, with the final walk to the exit featuring a gallery of art created by survivors of the Hiroshima and Nagasaki bombings.

The caves beneath Buda Castle have certainly had a bumpy history, and walking through them now is chilling (and not just because they keep the temperature at around 60°F). A tour through the narrow, oppressive hallways is a glimpse at our narrowly avoided nuclear future—definitely a sobering way to spend an afternoon.