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View looking south at a portion of the fortification wall on the north slope of the acropolis of Patmos that is called the “Kastelli” (acropolis). These fortifications date to the Hellenistic Period—that is about the third century B.C.
In the foreground of the image note the limestone and limestone boulders that form the north slope of the acropolis. The actual acropolis is on the top of this slope.