The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

Right next to departures—how convenient!

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

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

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

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

A portal into the bricked up canal that runs through the heart of Washington D.C.

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

Before Nixon, "watergate" meant canals.

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

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

‘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.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

People escaping slavery may have hidden inside a corpse vault.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

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

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

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

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.