Two hillforts are located in the vicinity of the Molavėnai village. Two nature monuments are protected by the state – an old oak tree near one of the hillfots and a stone called Mokas. Molavėnų I hillfort was first erected in the 1st century AD and consisted of defensive fortifications and a wooden fort. The site is located on a long (350 m), narrow projection into a bend of the river Šešuvis. The site is protected on the northeast and southwest by steep slopes, marshy banks, and the river. To protect it on the northwest, the only known Lithuanian double defensive system that uses earth and wooden outworks was erected on the projection’s neck. In all, it consisted of five ditches, four earthworks, and three levelled courtyards. A fortified settlement was built at the southeast end. In addition, the levelled hilltop areas were surrounded by palisades of sharpened poles. Artefacts dating from the early 1st century to the early second millennium were found during 21st century excavations. The site was eventually abandoned due to continued erosion and the shrinking hilltop.
Molavėnų II hillfort was built 400 m upstream in the 12th century on another projection at the confluence of the river Šešuvis and its tributary, the Jaujupis. Only the northeast and east sides were not protected by natural defences and so were instead guarded by a series of four earthworks and four ditches. A 20 m long earthwork with a corresponding ditch was constructed on the southwest slope. The flat hilltop was ringed by a wooden defensive wall. A tower was erected on the big earthwork, and wooden palisades on the other earthworks. A 2009 excavation discovered pottery dating to the 12th–14th centuries. Dry stone revetting was also found in one ditch.
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.