National Museum

This guide to the National Museum in Prague follows the mystery of August 21, 1968, when Warsaw Pact tanks entered Prague and machine-gun fire tore into the museum's sandstone facade, and no one ever gave a straight answer why. You'll hear the competing theories that circulated afterward, from mistaken identity with the railway station to a stray shot from inside the building. Restorers patched the damage between 1970 and 1972, though the new stone never quite matched the older sandstone around it.