15. Kleftiko Beach
Kleftiko Beach, on the Greek island of Milos, offers an opportunity to see multiple sea arches, some of which are big enough to navigate boats through. These elaborate arches are located off shore, and come in all sizes and shapes. They are accessible only by boat. Most boats include a stop for swimming and snorkeling in the cruise. Local legend says that pirates used to hide out in the on- and offshore caves.