The dark structure at the top of the hill is the Monestary of St. John the Theologian. Originally the entire island of Patmos belonged to the monestary and the only other buildings were things used by the monks to maintain their existance. But during the Turkish occupation the monks sold off land piece by piece to pay taxes to the Turks to keep them from hurting the monestary, so now there are small communities dotting the island such as you can see in the foreground.