These ruins are what remains of a medieval castle built by knights on a Greek island in the Aegean. Where are we?
The Knights of St. John built this castle in the 14th century on the island of Halki, which is closer to Turkey than mainland Greece. The castle is a popular attraction on Halki and a short uphill walk from the port village of Emporio, the island’s only town.
The correct answer is Halki.