400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Erosion and time have created a naturally-formed water park.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

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

The home of 1.5 million wood letters for printing is still a functioning workshop.

The titular fictional logger only inhabits this otherwise historically focussed museum via a piece of fiberglass kitsch.

Giant six-pack could provide one person a six-pack a day for 3,351 years.

Statue dedicated to the star of an old television show.

A lovely hidden waterfall right off the highway is well worth a stop.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

Paranormal activity on the great lakes.

A metal ring in the middle of the road marks the exact spot where the Soviet satellite crash-landed in 1962.

This historic Illinois "Muffler Man" has been converted from axe-touting lumberjack to rocket-wielding space ace.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

The hometown of Popeye's creator is littered with a growing collection of granite cartoon characters.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

While he no longer has an eatery to give him context, this off-brand Paul Bunyan still holds his giant hot dog with pride.

This urban drawbridge gained eternal pop culture fame when the Blues Brothers jumped it while it was raised.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.