6Porto Katsiki, Lefkada, Greece

Another Greek treasure, Porto Katsiki on Lefkada Island is a showstopper. Set against towering cliffs, the sea glimmers with an almost neon turquoise hue.

The water is exceptionally clear, making it a favorite for swimmers and photographers alike. Accessed by a staircase that winds down the cliffs, the view from above—watching sunlight dance on the transparent water—is unforgettable.