The Koules or Castello a Mare is a fortress located at the entrance of the old port of Heraklion, Crete, Greece. It was built by the Republic of Venice in the early 16th century, and is still in good condition today.
The site was possibly first fortified by the Arabs in the 9th or 10th centuries. By the second Byzantine period, a tower known as Castellum Comunis stood on the site. In 1303, the tower was destroyed in an earthquake but was repaired.
Source: Wikipedia.org
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