Palaiokastro, Agios Adrianos
At the summit of the rocky hill, known as 'Paliokastro' or 'Hadrian's Castle', east of the village of Agios Adrianos, is a small fort that was built at the end of the 4th century BC. The fort was built with the grey local limestone using the polygonal masonry technique. It consists of a large curtain wall, 50m x 26m, and a fort at the highest point of the hill. In the southwest corner of the enclosure, there is a trapezoidal tank, 3.15 m deep, whose interior is coated with plaster. The square fort, whose sides measure 9.20 m, has survived to a height of 3 floors. On the west side, where the 0.95 m wide entrance gate is located, a 2.10 m high monolithic lintel has survived.
The fort has not been systematically studied. A small area on the lower southern slopes was excavated in 1890 by the Argos high school headmaster, I. Kofiniotis, with funding from the Archaeological Society.
The construction belongs to a network of forts from the Hellenistic period, which controlled the land route that connected the city of Argos with Epidaurus.