A labyrinthine tunnel system beneath Buda Castle Hill in Budapest that served as a bombproof hospital during WWII, treating civilians and soldiers during the Siege of Budapest, and later expanded during the Cold War into a nuclear shelter with air filtration systems. Visitors explore the original underground hospital spaces and Cold War-era bunker installations through guided tours only, viewing period medical equipment, supplies, and structural features that reveal the site's dramatic wartime and Cold War history.
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