Explore the subterranean city

Word to the wise: Tickets can only be bought on the day of the tour.

Talk of the town: At Pankstrasse station, a bunker built in 1977 was intended to shelter 3,339 people for up to two weeks in case of nuclear attack.

Descend into Berlin's underworld to explore the city's history on a unique journey through the spooky network of subterranean tunnels. See the remains of Hitler's torture chambers, resistance fighters' hideaways, the oldest surviving bomb shelters and public bunkers built to hold and sustain thousands of Berliners in the event of a nuclear war.

Most fascinating are the escape tunnels dug from East to West by desperate citizens during the 'Wall Years'. Some were successful, others tragically not, but the stories told by the historian tour guides evoke the fear and panic of the thousands of Berliners who tried to flee to freedom.

There are several different walking tours, each lasting from 90 minutes to 2.5 hours, as well as an interesting museum.