You can take a ferry (with two different companies) from Kas in the morning to Greek Megisti (in Turkish Meis, old Italian Castellorizo) and return in the afternoon.
The island's official name, Megisti (Μεγίστη) means "biggest" or "greatest", but at only 11.98 km2 (4.626 sq mi) in area, it is the smallest of the Dodecanese. The name refers to the fact that it is the largest of the small archipelago. This name was used in antiquity, but is now rarely used in Greek, the name Kastellórizo (Καστελλόριζο) being common since the 12th century.
In 1306 the island was taken over by the Knights Hospitaller, headed by Foulques de Villaret, as part of their expedition to conquer the island of Rhodes, which became the centre of their Crusader State.