This bridge over D.C.'s Rock Creek Park is sometimes called the "Buffalo Bridge" because of its four buffalo sculptures, which were cast from a single piece of bronze.

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

A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

A public art jibe at one of the United States’ oldest and longest-serving senators.

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

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

There's a crumbling old mansion inside the Smithsonian National Zoo.

At 207 feet, one of the world's longest continuous escalators.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

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.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The site of the climactic scene from the classic horror film is now a historic landmark.

A celebrity from the late Cretaceous period.

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.

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

The most accurate timepiece in the world.

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

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

One of Gettysburg’s least visited battlefield memorials is off the beaten path, but worth a visit.

While seemingly a cruel joke, this bench actually honors an esteemed member of the community who passed away in 2006.