Santorini, Greece

Santorini's white-washed cycladic architecture tumbling down volcanic caldera cliffs to an impossibly blue Aegean Sea is arguably the world's most recognizable travel photograph. The village of Oia's blue-domed churches have generated over 30 million Instagram posts, 50% more than the typical Greek island. The island receives 3 million visitors annually, far exceeding its 15,000 permanent population, and averages 10,000 posts per day during peak season.