Abandoned since the 1950s, the streetcar lane beneath the heavily trafficked bridge lays empty and unused.

Once home to the largest photo service in the United States.

The hippo that stands on this university campus was once a drunken flea market purchase.

Home to two notable early-20th-century Black educators, Lucy Slowe and Mary Burrill.

This historic boathouse was constructed using salvaged lumber from burned barns.

Now a living classroom, this house was once the home of Reverend James Clinton Dent, a formerly enslaved man and a pastor.

One of the last mosaic tile facades found in the city.

One of the first Second Empire-style buildings constructed in North America.

A brass and marble scale model of the solar system embedded in the concrete.

A street in front of NASA's D.C. headquarters has been named in honor of the Black women who were essential to early spaceflight.

The former home of the woman who successfully fought to integrate restaurants in Washington, D.C.

Washington D.C.'s most famous pianist, composer, and bandleader still tickles the ivories outside Howard Theater.

Depending on who you ask, this controversial treehouse is either a charmingly creative child's playhouse or an illegal encroachment on public land.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

The National Park Service’s best-kept secret with views that rival any in D.C.

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

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

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

Where you can hail your favorite fictional commanders-in-chief.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

A much-maligned monument to teetotalism.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

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

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