Can't really see it very well due to haze, but I'm pretty sure that's the Acropolis of Lindos. It has an Ancient Greek temple dedicated to Athena, as well has some other large columnar buildings. The Knights of St. John built a castle surrounding the citadel in the 14th century. I took some pictures with my Nikon and will have to take a look at them later. Can't see much in the cell phone pics.