A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

The district's only illusionarium supports free writing programs for local students with every purchase.

This nine-story building is the oldest standing skyscraper in D.C.

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

The school tested mustard gas for the U.S. Army during World War I.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

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

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

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

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

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

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

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

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

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

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

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

Washington's iconic carousel has a nice piece of Civil Rights history.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

The first presidential bomb shelter was located in an old vault under the Treasury, connected to the White House via tunnel.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.