Climb to the Hidden Cold War Surveillance Post

When ascending the 215 stone steps inside the bell tower of St. Nicholas Church, take time to explore the intermediate levels rather than rushing directly to the panoramic gallery. Hidden halfway up is an authentic, preserved secret police observation room codenamed 'Kajka'.

During the Cold War, communist secret service operatives used this specific room around the clock to covertly film and monitor the gates of nearby foreign embassies positioned directly below in the diplomatic quarter. The space has been preserved with period telephone equipment, telephoto surveillance cameras, and agent logs, offering a startling twentieth-century historical surprise tucked inside a classic Baroque monument.