6Porto Katsiki, Lefkada

Porto Katsiki is consistently ranked among the most beautiful beaches in Greece, but its cliffs make it hazardous. Rockfalls are a genuine risk, with debris occasionally falling onto the sand where sunbathers rest.

The sea itself is relatively calm, but getting to the beach involves descending steep steps cut into the cliffs, which can be treacherous for those with mobility issues or in extreme heat.