File:20160518 Johnstown Ordnance Depot Laboratory.JPG

Royal Canadian Ordnance Corps Depot Johnstown was a large concrete reserve ammunition magazine for the major naval gun batteries in Sydney Harbour and Canso Strait, located at Johnstown, Richmond County, Nova Scotia, Canada, on the southeastern shore of the Bras d'Or Lake. All that remains is the laboratory building, now a private residence, one of the Magazine structures, now used as a storage building, and the concrete foundation pad of the second Magazine Building.