The simple, dignified 11th-century Rotunda of St Martin (praha-vysehrad.cz) is regarded as Prague’s oldest-surviving building. The rotunda's position here is testament to Vyšehrad's importance during the time of the early Bohemian kingdoms. The structure’s thick walls and high, narrow windows are classic elements of Romanesque (pre-Gothic) architecture. The door and frescoes, though, were added much later, during renovations carried out around 1880. During the bloody 17th century, when Vyšehrad served as a military fortress, the rotunda was used to store gunpowder.
The rotunda is normally closed to visitors, but the tiny interior can be viewed during mass times that are usually posted on the door.
