In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

An abandoned water sports stadium that has become a haven for graffiti and decay.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

This store also houses a museum dedicated to the history of these small, historic community shops.

According to the experts at the Guinness World's Record office, this is the longest candy counter in the world.

Stumps of an Ice Age forest, visible only at low tide.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

A century-old network of freight tunnels underneath the city's historic business district.

This museum on a college campus pays tribute to the Arctic and to two explorer alumni.

The debris forms a solemn memorial to those who died in a 1963 accident.

The world's oldest and largest museum of mass transit vehicles.

This handsome giant is said to mark the birthplace of the mythical woodsman and even had a cameo in a Stephen King novel.

No one knows how many bodies are in this vault in a Chicago public park.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The ghost town that ended up on Ebay.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.