hoo fort, medway, kent

two circular moated forts were built on islands in the river medway in the 1860s, here seen from hoo church tower. both remain remarkably complete though difficult to access. being still owned by the ministry of defence, trying to get into hoo is still illegal, probably for legal or health and safety reasons; it can't be to protect the building, as they've tested explosives here in the past bringing a floor down.