6The Caves of Diros, Peloponnese

Located on the Mani Peninsula in southern Greece, the Caves of Diros are a hidden underground wonderland waiting to be explored. Discovered in the 1950s, these limestone caves are home to stunning stalactites and stalagmites, underground rivers, and crystal-clear lakes. Visitors can take a guided boat tour through the caverns, marveling at the natural formations and learning about the cave’s fascinating geological history.