Teodora G.
Google
The museum is located under the Yalta Hotel on Wenceslas Square. You need to book in advance on their website. The ticket is 400CZK (330 for students and for kids 120CZK). For that price, you will get a 2+hour full quality tour trough a former secret nuclear fallout shelter built during the communist regime.
You will get a chance to see the rooms of the shelter and hear some interesting stories about each one. (Surgery room, Room of Border guards, the Room of Public Security, the Spying Room and the Operator Room).
The tour guide is a highly professional one, well informed about the whole WW1, WW2, and communist regime periods, as well as the functions of military and the police forces from those periods. And also has a great sense of humor, so you won't be bored by his stories, trust me!
The tour is also interactive.
Highly recommend!