The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

The first memorial dedicated solely to the Black troops who fought for the Union.

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

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

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

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

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

This theatre was made famous after Lee Harvey Oswald was captured inside watching a film.

This downtown Dallas art installation is always on the lookout.

A registered historic landmark shrouded in unsettling local legends.

A quirky collection of old chairs fills a random vacant lot in suburban Texas.

A Beaux-Arts triumph set to become Ford's innovation campus

What was once the largest NFL stadium.

This former county courthouse was originally an opulent hotel and entertainment venue.

Its floors are marked by colorful cues depicting Michigan's native fauna.

One of the few working locomotive roundhouses in the United States.

In the main dining room, a nine-ton boulder caps the fireplace designed by local architect Earl Young.

These grassy undulations on a stretch of University of Michigan campus aren't bad landscaping, they're art.

Lovingly nick-named the "Brick Dick" this municipal tower was winner of the World's Most Phallic Building Contest.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.