TOP-6 the most beautiful islands of Greece
Kos

The main monument Byzantine culture is the island of Kos — the birthplace of Hippocrates. In Kos you can visit the excavations of the ancient amphitheater, the remains of temples, ancient market and the wide variety of other historical monuments.
Kos or Cos is a Greek island, part of the Dodecanese island chain in the southeastern Aegean Sea, off the Anatolian coast of Turkey. Kos is the third largest of the Dodecanese by area, after Rhodes and Karpathos; it has a population of 33,388 (2011 census), making it the second most populous of the Dodecanese, after Rhodes. The island measures 40 by 8 kilometres (25 by 5 miles), and is 4 km (2 miles) from the coast of the ancient region of Caria in Turkey. Administratively, Kos constitutes a municipality within the Kos regional unit, which is part of the South Aegean region. The principal town of the island and seat of the municipality is Kos town.