Beyond Santorini and Mykonos: 8 Fairytale Islands in Greece You Need to Visit

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4Kefalonia

As the largest of the Greek Islands in the Ionian Sea, the magical island of Kefaloniá teems with pine forests, towering cliffs, olive trees, cobalt lakes, ancient castle ruins, and majestic caves.

You can take a boat tour that will ferry you inside Melissani Lake, an underground lake with crystal-clear water that lets you see all the way to the bottom.