Segesta was one of the major cities of the Elymians, one of the three indigenous peoples of Sicily. The hellenization of Segesta happened very early and had a profound effect on its people.
On a hill just outside the site of the ancient city of Segesta lies an unusually well preserved Doric temple. It is thought to have been built in the 420s BC by an Athenian architect, despite the city not having a large Greek population. The temple has six by fourteen columns on a base measuring 21 by 56 meters, on a platform three steps high. Several elements suggest that the temple was never finished. The columns have not been fluted as they normally would have been in a Doric temple and there are still bosses present in the blocks of the base (used for lifting the blocks into place but then normally removed). The temple also lacks a cella, any ornamentation, altar or deity dedication, and was never roofed over. The temple escaped destruction by the Carthaginians in the late 5th century.
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.