City on the Crater, Santorini
From Wikipedia: Santorini is one of the Cyclades islands in the Aegean Sea. It was devastated by a volcanic eruption in the 16th century BC, forever shaping its rugged landscape. The whitewashed, cubiform houses of its 2 principal towns, Fira and Oia, cling to cliffs above an underwater caldera (crater).
SantorinicraterGreeceCyclades IslandsAegean SeavolcaniccliffsFiraOia