The streetcars themselves are long gone, you can find some scattered infrastructure around town if you know where to look.
The Washington Aqueduct forms the central node in DC's water infrastructure. This marvel of engineering was designed before the Civil War and is still in use today.
Henry Foxall came to Washington in 1800 with an armload of defense contracts and established a munitions plant on the banks of the Potomac. He was here at the personal request of Thomas Jefferson, who felt that the federal city needed its own cannon foundry.
The Glover Park neighborhood north of Georgetown is named for Charles C. Glover, a prominent Washington banker and civic leader.
Ever drive past this out of place looking gas station next to the Watergate hotel? That's the old Higgins Service Station (more widely known in recent years as the Watergate Exxon), it is one of Washington's most iconic gas stations.
The Georgetown waterfront is one of the oldest areas in the Washington region. Over the years it has experienced evolving periods of commercial prosperity and urban blight. Today it is a park.
Riggs Bank was a Washington institution for over a hundred years. More than 20 U.S. Presidents (ranging from Lincoln to Nixon) banked at Riggs, and their headquarters across the street from the Treasury Department used to be pictured on the back of the old ten dollar bill.
The American Ice Company once operated five ice factories and numerous storage facilities in Washington, supplying 85% of the city's ice.
When Dean & DeLuca moved into their new Georgetown location on M Street in 1993, they joined in a grocery tradition stretching back to the Eighteenth Century.
This graffitied hangout on the banks of the Potomac is the stubby remnant of the Alexandria Aquaduct.