Two monstrous warehouses. One now holds priceless works of art, the other stands abandoned and dilapidated.

Where there’s manufacturing, there’s fire!

The humble fort that saved Washington.

The factory that helped produce a dominant form of lighting before Thomas Edison.

A strip of modern stores in historic buildings.

The engineering feat of the Panama Canal was possible in small part thanks to materials developed in this humble Red Hook foundry.

A massive forgotten storehouse from 1913 on the Brooklyn Waterfront has a spectacular view of Brooklyn.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Walk into the 19th century without leaving Brooklyn.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

On this island, you suck away your garbage via an elaborate pneumatic tube system.

One of only two commuter aerial tramways in the United States.

Site of the first pathological and bacteriological research facility in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

Little has changed in the way that this mill operates since the 18th-century.

A renovated schoolhouse that highlights the history of Clarke County's Black community.

A glimpse into early 19th-century education.

The oldest existing one-room brick schoolhouse in Loudoun County.

Unrepaired walls from a 1920 anarchist bomb attack.

The birthplace of the Herndon Gas Company.

Where pardoned turkeys once spent their all-too-brief final days.

The last vestige of a once substantial orchard and farm in the suburbs of Northern Virginia.

The only U.S. Senator to die on the field of battle is buried in San Francisco but memorialized at Balls Bluff Regional Park.