Catch a glimpse of the Cold War era at the nuclear shelter Kryt Folimanka, which is open on Aug. 19 from 9 a.m. to 3 p.m. The large complex, which can hold up to 1,300 people, sprawls under the hillside at Folimanka park. Visitors can wander around freely and address questions to Prague District Office employees or any volunteer workers inside, who speak Czech, Slovak, English, and Russian. The entrance is free of charge.