Berliner Unterwelten

The rich underground world of Berlin can be explored on the special guided tours (some in English) with this non-profit organization. Each offers a fascinating glimpse into a world normally hidden to the public, making this underground exploration particularly fascinating for hard-to-entertain tweens or teens. You can see bunkers and anti-aircraft fortresses from World War Two, as well as raid shelters, ghost subway stations and escape tunnels from the Cold War. There are several tours to choose from (Dark Worlds, Subways-Bunkers-Cold War, and Breaching the Berlin Wall among the most exciting), and all must be booked well in advance.