Boat tours of Meganissi island will almost certainly include the impressive sea caves that have carved their way into the soft white limestone along the west coast of Meganissi.
The biggest, and by far the most famous of these, is the Papanikolis Cave which is said to be the second largest sea cave in Greece. Papanikolis Cave has a huge chamber about 120 metres long and 60 metres wide.
There is an estimated 40,000 square feet of water surface in the cave chamber and the roof is about 30 metres above the water at the highest point. There is plenty of room to get a boat inside and island caiques usually venture inside. There is even a sandy crescent at the deepest point of the cave.
Papanikolis Cave is thought to have been used as a hiding place for German submarines in World War II, but I've yet to have this confirmed.
Stalactites drop down from the roof and cavern walls at this and several other caves along this part of the coast. Another nearby cave ,called the Alabaster Cave, has even more impressive stalactites than Papanikolis. Other well-known caves in the region are those of Yiovani and Demona, accessible only by boat.