Wooden pavers represent a 17th-century barrier that gave Wall Street its name.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

She stares out across six lanes of traffic, clutching a musket and infant with determination.

You could be standing at the site of one of D.C.'s most fatal tragedies and not even know it.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

Experience the pivotal Civil War battle at this interactive museum.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A historic ruin just 20 feet away from a busy highway onramp.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

‘Bush the old fire dog died of poison July 5th, 1869. RIP.’

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The site of the climactic scene from the classic horror film is now a historic landmark.

A wondrous old library overlooking the nation's capital.

The revival of a classic Art Deco theater.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

When it comes to handsignals (and colonialism) rock always beats scissors.

FDR's Art Deco hospital tower was hopelessly inefficient.