Jordan: Karak Crusader Castle
Karak castle is a massive fortress built on a clifftop by crusaders to control the trade route from Egypt to Damascus and Arabia. Crude but impressive architecture features massive thick walls, narrow slit windows, underground passageways, and towers after towers of several meter thick fortifications. This one is built to last, it ain’t IKEA. Built in 1140, it withstood several sieges by Salladin (three times) and Mamluks over the centuries, and was one of the main and largest crusader castles in the Middle East.