The remains of the ancient settlement at Kastri are saved at the top and on the west side of the hill. The settlement was surrounded by a strong defensive wall, the course of which one can observe among the dense vegetation. The wall consists of imiergasmenous boulders, built in irregular polygonal system. On the southwest side of the revealed small gate with jambs and threshold. Lower to a plateau in the hill west section detected strong protective Hellenistic wall.
At the top of the hill, northeast of the church of St. Nicholas, revealed redoubt, which due to its dominant position should be used as an observatory and as guard accommodation. The fortification wall is built of roughly worked large and small stones in irregular polygonal system, and bring in props intervals. On the south side of the formed gate threshold, in which the studs are saved for the valves of the door. In this position he found imiergos stone engraved with an inscription “[W] YLIOIO”, which is undoubtedly related to the gate of the wall and was probably dedicated to Hermes Pili. The finding also on the same hillside of votive inscription “Bride Acheloos” etched in bronze statuette base, now lost, testifies to the existence of a temple dedicated to the Acheloos.
On the western slope diakrinonai remains of buildings dating back to the Classical and Hellenistic period. Due to the high slope of the buildings built in different ground levels, which were held with retaining walls. In the area I saved two rectangular stone structures with identical tanks dating to classical times and in III metallurgical furnace ellipsoid shape, built of tiles and slates.
From Neolithic settlement, which existed on the southern slope of the hill, not preserved building remains, only a few superficial finds, mostly pottery fragments.
Kastri hill that rises north of Evia Fluvial community, the remains significant settlement survived, developed in classical and Hellenistic times. The oldest traces of Kastri date to the Neolithic era (4th millennium BC), as shown by the surface finds, identified on the south side of the hill.
The settlement of the classical period was established in the 4th century. B.C. and scholars have considered up to the 3rd century. B.C. He belonged to the territory of Eretria. Protected by a powerful defensive wall with a gate, and the archaeological finds show that the area of the receiving country cottage activities. During the excavations found a metallurgical furnace, roof tiles, clay loom weights (loomweights), clay figurines, millstone scrap, copper coins, metal gadgets, stone votes, inscribed tiles and raw stones engraved with symbols or letters, whose interpretation remains problematic. Finally found wealth copper coins, most of which belong to Evia Confederacy and dated to the 3rd century. B.C. The most common numismatic type is the one with a bull on the obverse and the reverse STAFYLIDOU. The remaining coins from Halkida, Istiea, Eretria, Athens, Chios and Macedonia, dating to the 3rd and 2nd century. B.C. Macedonian coins belonging to the period of Antigonus Gonatas (277-239 BC) and present head of Athena on the obverse and Pan erecting trophy on the reverse. The hill was inhabited until the beginning of the 1st century. B.C. and until the 6th century. A.D. there is no archaeological evidence of building activity or occupation in the region. In the 6th century date limited traces of Byzantine buildings, element that leads us to believe that perhaps in those years and later fortified Kastri used as an observatory.
The first surveys of Kastri were made in the early 20th century by the principal of Kimi and curator of antiquities K. Papaioannou and then the headmaster Halkida C. Papavasileiou. In the years 1976-1978 was first excavated by archaeologist A.. Sampson, with the municipality Kimi expenditure and the Community Potamias.