St. Martin Rotunda
Located in the mythical fortress of Vysehard, St. Martin Rotunda is the oldest rotunda in the city of Prague and the only structure from the time of Vratislav I that is still intact. The building dates back to the 11th century, the interior was altered in the 19th century by architect A. Baum. The Rotunda of St. Martin is also the oldest surviving building in Prague. The rotunda is open during services only.
Vyšehrad, Praha 2