A set of ‘Dragon’s Teeth tank traps were built on the outer defences of Dover Castle as part of the emergency defences of the castle following the fall of Dunkirk in 1940 and were designed to deter armoured vehicles. The remains consist of a triple row of concrete blocks on the north western side, near the tip of the Spur, and a single row on the east side of spur, close to the road. (location accurate to the nearest 1m based on available information)