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The principal attraction of Cennet Island. You can drive or cycle most of the way, then it's a 400 m trail to enter the cave, believed to have been inhabited since 10,000 BC.
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This site has been fortified for thousands of years but the castle you see now was built by Suleiman the Magnificent in preparation for his 1522 assault on Rhodes. It was shelled by a French warship during World War 1, nevertheless it was one of the few structures in town to withstand the double earthquake of 1957. It was restored from 1979 and opened as a museum in 1991.