The famous Alepotripa and Vlichada caves are located in Pirgos Diros in Mani in the Peloponnese. They were explored by the speleologists Ioannis and Anna Petrochilos. The Alepotrypa cavern was discovered in 1958. Archaeological research begun in 1970 under the direction of archaeologist Georgios Papathanassopoulos. In the course of the late Neolithic period (4000 – 3000 BC), the cave was extensively used as shelter, dwelling, workshop, storage place for goods, cemetery and a place of worship.

Human skeletons were found on the surface, showing that the entombment did not take place, leading archaeologist Papathanassopoulos to conclude that these Neolithical people died suddenly during a strong earthquake that caused huge rockslides in the area.

The cave of Blychada covers a large 16,700 square meter area. 2,800 water passageways have been explored. Visitors can take a 40-minute boat ride through a 2.5-kilometer-long winding passageway and enjoy an intricate network of passages and galleries that are decorated with gleaming stalactites and stalagmites.