The Berlin Underworlds Association allows you to experience Berlin´s history from an unusual perspective, through its underground installations dating back to the Cold War, World War II, or earlier. Visit a bunker from the Nazi era on the Dark Worlds tour, the rubble-filled Flak Tower Humboldthain, a large bunker complex on the 'Subways, bunkers and Cold War' tour, or the 'Breaching the Wall' escape tunnel tour. The meeting point is at the southern entrance of the Gesundbrunnen U-Bahn station.

Admission €10-13/8-10.