The ruined fortress Belvedere or Rizokastro, the seat of the homonymous Castellana during the Venetian occupation, is located on the hill Kastellos northwest of the village Kastelliana, where in ancient times the city of Priansos was sited. Inside the fortress there are the ruins of the Early Christian Basilica of Priansos with a mosaic floor, as well as six temples. The three of them, including the domed church of Saint George at the peak, are completely ruined. The surviving churches are Saint Anastasia, Kato Panagia and Pano Panagia.
The temple ofPresentation of Mary or Kato Panagia is located near the southern part of the castle and is a small single-nave church built in two phases. The oldest, probably of the first half of the 14th century, belongs to its eastern part, and preserves little traces of frescoes of this period. A little later, in the second half of the 14th century, the western part was added, as dated by the fragmentary preserved frescoes. This part hosts scenes from the Mariologian cycle, the scene of the Second Coming and figures of Saints.