The largest self-built castle in the U.S., six decades in the making.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Small plaque marks the spot, but the true center is located about half a mile away on a private pig farm.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

Two hula hoops appeared on the tree after a storm, and the collection kept growing.

The home for all things Kool-Aid offers everything except a chance to actually enjoy the drink.

An old town theater converted into a celebration of the hobo legacy.

A landscape of massive spherical boulders are the main attraction in this Kansas State Park.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

European castle ruins in an American state park are actually the product of death and grief.

Community bookshelf of 25-foot-tall book spines.

The quirky collection includes treasures like Elvis' underwear, Bob Barker's toothbrush, and hundreds of sock monkeys.

The maximum security facility was once thought to have "the bloodiest 47 acres in America."

Destroyed by flood waters, prison now serves as a training ground for armed forces.

An eclectic assortment of medieval architecture in a small Iowa town.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

Curious cave that stays a cool 56 degrees all year long.

The obelisk meant to mark the founding father's grave at Monticello is actually on the University of Missouri campus.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

Another in a long tradition of legends regarding infernal seats.

This majestic tree has survived 400 years of storms, droughts, and floods, and is a beloved natural landmark in Missouri.

A number of gruesome unsolved murders have turned this simple home into a morbid tourist trap.