Considered as the best Greek island and frequently included among the most romantic destinations in the world, Santorini is visited by millions of tourists every summer. You will get impressed by the steep caldera, the amazing sunset, the improssive villages such as Oia and the red and black sand beaches (Red beach). Do not miss a trip to the volcano, whose top can be seen from any spot of the caldera. For swimming, head to the southern side of Santorini, where most beach resorts can be found.