Temporary B&O Bridge over Potomac during WWII at Shepherd's Landing Temporary B&O Bridge over Potomac during WWII at Shepherd's Landing Temporary B&O Railroad Bridge over Potomac during WWII at Shepherd's Landing St. Elizabeth's Hospital Steam Engine - 1955 St. Elizabeth's Hospital Steam Engine - 1955 View of Twinning Lake from Washington Monument 1892 - 14th St. Bridge in background Steam Powered Lawn mower on Capitol Hill in 1920s Upper Marlboro Road Conditions MD 1909 Circa 1905 Jungle of Wires at 14th & B St.