The 28,000-year-old specimen is remarkably intact.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

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

More than 500 unique and specially designed cases collected by D.C.'s "Harmonica Case Man."

Also known as the Founding Church of Scientology.

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

The elevator that makes it possible to fly American flags in bulk over the U.S. Capitol

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

A small token of gratitude from freezing cold journalists who were given a warm haven while covering JFK's inauguration.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

These abandoned waterworks are crumbling into the Potomac River.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

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

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

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

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

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.

100 years later, they're still down there.

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

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

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

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