Housed in this old air raid shelter is one of Berlin’s largest private collections of contemporary art. We’ve ridden by it on our bikes dozens of times and only recently realized it was home to an art collection which we’d heard about through friends. Visits to the bunker are by appointment only, so we decided to check it out this weekend.

The bunker was constructed in 1943 to shelter up to 3,000 people during air raids. There are 120 rooms on five floors, and the walls are up to two metres thick. At one point, the bunker became storage for tropical fruit – it was once called the Banana Bunker – and then a hardcore techno and S&M club in the 1990s. It’s now a fascinating space which houses sculpture, installation, painting, drawing, video and photography.