The world's longest known cave system.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

Prehistoric animals decorate this popular outdoor park.

One of the few surviving "Wigwam"-themed motels.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

The only working large-scale tea plantation in the United States.

This tombstone marks the final resting place of the beloved 1990's character, Ernest P. Worrell.

Unique tower has outlasted a takeover of the company.

One of the largest collections of merchandise from the famous British sci-fi show can be found smack in the middle of Indiana.

This 45-story tall abandoned skyscraper is the third tallest building in New Orleans and Lousiana.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

A hot dog stand where the heads are just as hot as the dogs.

A renowned Civil War veteran, this Bald eagle now presides over the Wisconsin State Assembly.

Comprised of Spanish war cannons, this sculpture once graced the bow of a WWI warship.

What appears to be a wizard's lair in Milwaukee actually houses a massive water pipe.

The Bong-area park police have asked visitors to please, stop stealing the signs.

A group of artists transformed this desolate city alleyway into an outdoor gallery of street art.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

Where a brain, a beauty, a jock, a rebel, and a recluse met one Saturday and changed their lives forever.

The sign to a demolished amusement park now stands in front of a local library.

This cemetery is all that remains of a school for "wayward" girls.

A hidden grotto on the grounds of the Kane County Government Center.

This architectural stunner is one of the few surviving Egyptian Revival theaters in the U.S.