Kos is a splash of deep green located between Kalymnos and Nisyros. Among the thousands of impressive sights are the, Asklepeion, the houses dating from the Roman era with the fabulous mosaics, the palace of the Knights of St. John, in the town of Kos, the early Christian churches with their noteworthy frescos. The island also has many villages famous for the charm, quiet fishing villages, and beaches, ranging from empty to full.