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

The United States Capitol's former columns still stand.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

It was once the base for a series of domestic terror attacks.

Perhaps the most scandalous statue of America's first president.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

There’s a hidden military meme engraved on the World War II Memorial.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

Largest Roman Catholic church in North America.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.

The first memorial dedicated solely to the Black troops who fought for the Union.

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

Obscure Freemasons still live in D.C.’s largest private residence.

At 207 feet, one of the world's longest continuous escalators.

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