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

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

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

"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!”

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."

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.

A historic neighborhood church is reborn as a psychedelic arts collective.

This lovely pocket park is one of the most under appreciated in D.C.

The oldest continuously operating fish market in the United States.

A former major munitions plant that has been converted into a sprawling art space.

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

This small pedestal marks the spot of the first lot of land sold in Alexandria, Virginia in 1749.

The narrowest house in America is seven feet of pure spite.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

America's first federal monument.

This rudder is one of the few remnants of a shipyard that once operated on the banks of the Potomac River.

Once forgotten and built over, this historic Black cemetery now houses a poignant memorial.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

A dozen U.S. presidents have stayed at the historic resort, which was known as James Buchanan’s “Summer White House” from 1857-1861.