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

An overlooked memorial honoring the local Washington residents who died in World War I.

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

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

Before founding the American Red Cross, Clara Barton had a tremendous humanitarian impact by locating thousands of missing soldiers.

100 years later, they're still down there.

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

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

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

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

This unassuming passageway played a key role in one of the most important events in U.S. history.

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

Before Nixon, "watergate" meant canals.

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

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

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

Look closely and you’ll notice that the color changes a third of the way up the tower.

A much-maligned monument to teetotalism.

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.

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

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.