This sky-high radio mast is formerly the tallest man-made structure in the world.

A palatial art deco restroom.

A jaw-dropping brutalist space church seems to have crash-landed in the middle of America.

14th century Norse artifacts in Northwestern Minnesota could have proved a Viking landing before Columbus.

This large midwestern cavern features impressive rock formations and an underground waterfall.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

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

Home to Hollywood history and a very special salt crystal.

See six states, pickled freaks, rocks, and antiques.

Cannon designed to fire an atomic warhead.

The 55-pound trichobezoar was removed from the stomach of a cow.

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

Home of mutant livestock.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

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

Final resting place of a 19th century gold prospector and convicted cannibal.

The remains of the dam that unleashed a 15-foot wall of water on Denver.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

A house carved into a rock in the 1940s.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

On a dusty county road sit the ruins of a ghost town's abandoned church.