One thing was for sure when foreigners stayed at the prestigious Jalta hotel in Prague during the Cold War — their telephone conversations were carefully monitored by secret police in a hidden bunker under the building. The massive bunker was meant to provide Communist Party members and military officials a shelter in the case of a nuclear attack. But it was also used as a center for surveillance operations. To mark its 55th anniversary, the bunker has been opened to the public as a museum. Inside you’ll find some of the original spy equipment, including a telephone switchboard, a tape recorder and numerous wires that once led to the hotel’s 94 rooms.