Levänluhta is a swampy source known for mysterious prehistoric findings. According archaeological excavations about hundred people have been buried to the former lake of Levänluhta in the Iron Age. Archaeologists have also found several remains of bronze and silver jewelry and tools.
There are remains of buried children, elderly and animals of different ages. The human bones of Levänluhta are dated to the 300-700's. They are historically thought to be sacrificed human victims, but the site can also be an ancient cemetery for people died of starvation or diseases.
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.