It is housed in the building of the former Kapodistrian Primary School of the city. Its collections consist mainly of excavations throughout the island, but also of accidental findings and traditions of citizens and are mainly pottery and sculpture works that cover the whole of the rich ancient history of the island, from the Prehistoric Period (Final Neolithic). era) until Late Antiquity.
The museum has a large exhibition on the ground floor. In the center of the building there is a patio, a square courtyard with a covered peristyle leading to the elevated hall.
Impressive are the exhibits from the Cave of Euripides, which was the secret sanctuary of the great tragedy writer, such as the marble figurine of the Cycladic ancestor and a vessel bearing the inscription of his name.