A must for history buffs, the Papanikolis cave is so large that a submarine was hidden here during World War II. In fact, it’s the largest sea cave in Greece. It’s also thought to have been used as a hiding spot for Aegean pirates.
Located on the island of Meganisi, off Lefkada, the natural cavern stretches 120m long and 60 wide amid limestone cliffs.
You can swim in its crystal clear waters and there’s even a beach inside where you can chill out and dry off.