If there's one must-visit while you're in Kos, it's the volcanic island of Nisyros. Greek legend says it was created from a stone thrown by the god Poseidon. And it's a scenic gem of an hour-long trip that takes you there. Visit Mandraki, Nikia, the Stefanos crater and more.

Once you've docked in the harbour of Mandraki, the island's capital, you'll head to the old village of Nikia on the edge of the Stefanos crater. Lose yourself in the labyrinth of cobbled stoned lanes or find a spot near the crater's edge, where you can feel the heat.

Afterwards, head back to Mandraki. Sugar-cubed houses stretch across this amphitheatre-shaped town, which is in the shadow of a medieval castle and the cliff-side monastery of Panagia Spiliani.