Officially known as Thira, Santorini is perhaps the most famous of all the Greek islands. Located at the southern end of the Aegean Sea, Santorini is part of the Cyclades group of islands and receives about 2 million visitors a year. That"s a lot of adoring attention for a small island (only 28 square miles) of 15,000 residents, and it"s no wonder why. The whitewashed, clifftop villages of Santorini, like Oia featured in this image, are postcard-perfect. And so are the unlimited panoramic views of the azure Mediterranean Sea.