Originally built by forced laborers in 1942, the shelter sheltered up to 25,000 people from Allied bombing. Post-war attempts to demolish it were impractical due to its massive size and location. Instead, it became a cultural center hosting arts events and music venues.
A recent €100 million renovation has seen the shelter gain five new floors supported by 16 steel columns, increasing the shelter’s height. The new floors house a hotel, café and public spaces, while the building’s exterior has been transformed into a lush park with 23,000 trees and plants. Visitors can reach this green oasis by climbing 335 steps or following the “mountain path” that circles the shelter.
Source: Ferra

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