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KGB Museum in Hotel Viru
The top floor of the Sokos Hotel Viru has a murky past you can step into and explore: for years it housed a secret K.G.B. office, but now it's a museum dedicated to spies and the overt game of gathering intel information.

You can take an English-language tour for just seven euros and learn all about how Russians used the hotel to spy on its Western guests. From a sign that read "There is nothing here," to learning about how everything from the sauna, to the ashtray, to the tea cup coaster was bugged, it's a fascinating experience.

In fact, locals joke that Hotel Viru was built from a new Soviet material called “micro-concrete”: 60 percent concrete, 40 percent microphones!