With more than 40 percent of Berlin's structures actually confined to the underground, its no wonder that Berlin's U-Bahn (underground railway) has become such a popular destination, behind each door possibly lies a labyrinth of bunkers, pipeline walkways, warehouses, tunnels and various other living quarters.
Many of the rooms of the Unterweltern are reinforced with steel and bolted doors that slam behind you as you discover each shocking structure. Creepy in its own right, the rooms have largely remained untouched since they were first built, and are mostly dark and dank, many places decorated with supplies and furniture, and the halls covered with green fluorescent signs meant to guide inhabitants from one place to another.
Review by Pat K, February 2013
Excellent tour. Our guide was very knowledgeable and entertaining too. Well worth the trip.
Review by Roy K, United Kingdom, February 2013