An underground magnet for ever-changing street art.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A life-sized memorial to Harry L. Collins, the official corporate magician of Frito-Lay.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

When flour explodes, it's not a pretty sight.

The only arched bridge made of stone on the entire Mississippi River.

Eight "Guardians of Health" protect this art deco water tower from pollutants and bacteria.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This replica of the Greek structure is in the heart of Nashville.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

Less a museum than a bizarre fantasy world created by artists and engineers.

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

This structure among the trees was the result of divine inspiration.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

The unbelievably opulent home built for an infamous newspaperman.

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

At Macon’s oldest cemetery two members of Allman Brothers are buried side by side.

After just one epic test blast, this literal loose cannon proved too explosive for combat.