The mountaintop Belvoir Fortress, a 13th-century Crusader stronghold near the Sea of Galilee, is the best-preserved Crusader fortress in Israel. Belvoir is based on the same concentric castle layout as the Tower of London. But unlike in London, you won’t need to fight through the crowds.
http://www.natgeotraveller.co.uk/destinations/middle-east/israel/israel-secret-citadel/