Crac des Chevaliers

Krak des Chevaliers, also transliterated Crac des Chevaliers, is a Crusader fortress in Syria and one of the most important preserved medieval military castles in the world.
Krak des Chevaliers was the headquarters of the Knights Hospitaller during the Crusades. It was expanded between 1150 and 1250 and eventually housed a garrison of 2,000. The inner curtain wall is up to 100 feet thick at the base on the south side,[1] with seven guard towers 30 feet in diameter.
Described by T.E. Lawrence (Lawrence of Arabia) as "the most wholly admirable castle in the world."
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