Gates........locks..............and skeleton keys............the oldest house in DC...........is the Old Stone House...........on M st..............NW.......Georgetown...............supposedly the only pre revolutionary war building still standing................................the lock..........is to be fitted by a skeleton key......



At the outlet of the Georgetown facility is a sluice gate building that controls the flow of water into Washington City Tunnel, which leads to the McMillan Reservoir. This structure, called the Georgetown Castle Gatehouse, was built by the Army (c. 1901) in the shape of a castle.^[3]