The Hill O Many Stanes is an area with about 200 upright stones, none more than a metre high. The rows are not parallel, however, and they create a fan-shaped pattern. This arrangement is believed to be a relic of Bronze Age times.
In Megalithic Lunar Observatories (Oxford University Press, 1971) Alexander Thom presented evidence that the stone rows were in effect a Bronze Age lunar observatory, tracking lunar movements over a cycle of 18.6 years. However, more than twenty similar stone rows are now known in Caithness and Sutherland and none of the others has been linked with astronomical observations.
In Britain stone rows of this kind are unknown outside Caithness and Sutherland, but similar rows of much taller stones are found in Brittany, France.
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.