The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

A toxic ghost town sitting atop a massive coal fire.

The site of a tragic massacre that spawned a multimedia franchise.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

There must be a pun in this haystack somewhere...

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

The most confusing clock in New York.

The only subway station in the city that still makes use of gap fillers.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Unrepaired walls from a 1920 anarchist bomb attack.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

At this Minnesota state park you can easily wade across the source of the mighty Mississippi.

"...I guess that was your accomplice in the wood chipper?"

America's largest viking stands in a Minnesota city that believes it was visited by the ancient nords.

One of two giant blue cockerel statues erected with an intentional double meaning.

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

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

20,000 pieces in a Frank Gehry-designed building.

Each year, one talented artist puts on a show sculpting twelve butter-based busts of dairy princesses.