Vila Koundouriotis — Historical Museum

An 18th-century stone mansion on the hillside above the town, once the home of Lazaros Koundouriotis — a shipowner and one of the financiers of the Greek Revolution. Today it operates as a branch of the National Historical Museum: preserved rooms with original furniture, costumes, portraits, and artifacts from the era when Hydra was one of the most important maritime centers in Greece. From the terrace, there is a view over the harbor and the sea.