The electoral hunting lodge Breitenbrunn (Jagdhaus) in the Ore Mountains community of the same name was converted from a watchtower, which was probably built in the 13th or 14th century, is now a ruin under monument protection and is a landmark of the place.
After a Vorwerk of the Schwarzenberg rulership was first built and later a settlement was built, the watchtower was converted into a hunting lodge, accommodation and storage for hunting utensils. The building, which was also used as the forester's house, burned down in 1610, including the newly added third floor and added Wendelstein, and in 1617, was rebuilt and fell into ruin, apparently unused, after 1700.
References:The Chapel of St. Martin is the only completely preserved Romanesque building in Vyšehrad and one of the oldest in Prague. In was built around 1100 in the eastern part of the fortified outer ward. Between 1100 and 1300, the Rotrunda was surrounded by a cemetery. The building survived the Hussite Wars and was used as the municipal prison of the Town of the Vyšehrad Hill.
During the Thirty Years’ War, it was used as gunpowder storage, from 1700 to 1750, it was renovated and reconsecrated. In 1784, the chapel was closed passed to the military management which kept using it as a warehouseand a cannon-amunition manufacturing facility. In 1841, it was meant to be demolished to give way to the construction of a new road through Vyšehrad. Eventually, only the original western entrance was walled up and replaced with a new one in the sountren side. The dilapidating Rotunda subsequently served as a shelter for the poor.