platamon castle

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The Platamon Castle (Greek: το κάστρο του Πλαταμώνα) is a Crusader castle (built between 1204 and 1222) in northern Greece and is located southeast of Mount Olympus, in a strategic position which controls the exit of the Tempe valley, through which passes the main road connecting Macedonia with Thessaly and southern Greece. The tower (donjon), which overlooks the highway, is an imposing medieval fortress.

source: http://en.wikipedia.org/wiki/Platamon_Castle