SIFNOS, GREECE - JUNE 16: Tourist gather in a group at a port after leaving a ferry on the way to Sifnos island on June 16, 2015 in Sifnos, Greece. Sifnos is a island in the western Aegean Sea, the surface area is about 74 square kilometres, and a member of the Cyclades group of islands. (Photo by Christian Marquardt/Getty Images)