8Milos Island, Greece

Milos is often overlooked compared to Santorini or Mykonos, but its waters are some of the clearest in the Aegean. The island’s volcanic origins have sculpted surreal rock formations and secluded coves with glassy turquoise seas.

Kleftiko, a former pirate hideout accessible only by boat, is especially stunning — its white cliffs and hidden sea caves create an otherworldly swimming experience. Sarakiniko Beach, with its lunar-white rocks, makes the turquoise water appear almost fluorescent.

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