Introduction to the Underground Labyrinth: The Underground Labyrinth (Budavári Labirintus) under the Gellert Mountain was once an underground castle and underground fortifications. During World War II, it was the location of a shelter and hospital. Entering the maze from an inconspicuous small building in the ancient city of Buda, the endless tunnels make people think of the secret exits of ancient castles that often appear in movies. Every wall, every corner, and every statue where the oil lamp touches The intriguing statues are a precious moment to experience the underground labyrinth hundreds of years ago.