The famous Vlichada cave (a.k.a Diros Caves) is located in Pirgos Diros. Many Paleolithic and Neolithic artifacts were here, many of which are in display in the museum. This drove to the conclusion that the caves were one of the earliest inhabited places in Greece.
The cave of Vlychada covers an area of 16,700 m2. Since 1949 about 2,800 water passages have been explored.
The main route for sightseeing is a 2.5-km-long winding passageway. During a 40-min boat trip, the visitor will comes across a complex and maze like network of passages and galleries, decorated with stalagmites and stalactites, whose reflection in the water enhances their natural beauty. The guided tour into the cavern of Vlychada takes place by boat and on foot – part of it is on land.