A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

Daily lunch spot for many of Washington, D.C.'s cab drivers.

A building shaped like the Army Corps of Engineers logo, because why not?

When it comes to handsignals (and colonialism) rock always beats scissors.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

100 years later, they're still down there.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

There's an old indoor swimming pool hidden directly underneath the White House Press Briefing Room.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

This forgotten boat elevator was an engineering marvel in its heyday.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

A historic arena where the Beatles played their first concert in the U.S.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

Before Nixon, "watergate" meant canals.

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

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

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

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

There’s a special club house at the top for the bell ringers.