Discover the second largest sea cave in Greece by taking a fun-filled boat tour from Nidri, on the east coast of Lefkas. Crossing the water from the harbour to Meganisi Island, your boat tour will take you to Papanikolis Cave, a striking natural cavern with a fascinating story to tell. As the boat sails slowly through the small entrance to the cave, set in impressive limestone cliffs, you'll be greeted by a huge cavern stretching 120 metres long and 60 metres wide. Take the chance to cool off in the crystal clear waters as your boat moors up just outside. There's even a small crescent-shaped beach where you can relax before swimming back to the boat for the next stage of the trip. On your tour, you'll find more about the history of Papanikolis Cave. During the Second World War, it's believed the cavern was used as a hiding spot for Greek submarines seeking cover after attacks on Italian ships. Legend also has it that the cave was used by sailors to escape from fierce pirates in the Aegean Sea. Papanikolis is only accessible by boat, either through an organised tour from Nidri or by hiring your own motorboat. Most tours last all day and include a visit to the village of Spartochori on Meganisi, as well as beach barbecues and the chance to snorkel in the crystal clear seas. If you're sailing yourself, take a trip north to Alabaster Cave near Lefkada to see incredible stalactites.