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

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

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

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

Amid the sprawling Defense Intelligence Agency Headquarters is one of Washington's least accessible museums.

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

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

The world's oldest soul food restaurant is also one of its best.

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

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

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

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

A much-maligned monument to teetotalism.

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

Go take a picture with the inventor of the daguerreotype photographic process.

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

For 60 years, the academy had no permanent location until members voted Washington D.C. as its forever home.

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

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

This poor little statue is the most vandalized memorial in Washington.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

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