Washington's iconic carousel has a nice piece of Civil Rights history.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

Part of a WWII submarine is lurking outside the Washington Navy Yard parking lot.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

A secret greenspace hides atop a Capitol parking garage.

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

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Mysterious installations bring levity and light to a sometimes stodgy city.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

The tunnel under the Capitol Building where Congress takes out its trash.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

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

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

This grand gothic brewery has been pumping out suds for over a hundred years.

People escaping slavery may have hidden inside a corpse vault.

A public art jibe at one of the United States’ oldest and longest-serving senators.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

A tribute to the pop culture icon overlooks this Washington D.C. intersection.

There's a crumbling old mansion inside the Smithsonian National Zoo.

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

A surprising, but overlooked example of geology in the middle of the nation’s capital.

An amazing example of early-20th-century architecture, this church features marble transported from Utah.