Once known as the Illinois Asylum for the Incurable Insane.

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

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

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

A wonderland of caves in eastern Iowa.

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

The beginning of the historic Iditarod Trail connecting the Alaskan cities of Seward and Nome.

The now-serene site of the largest earthquake ever recorded in North America.

Considered by many to be one of the most dangerous highways in Alaska.

Plymouth's huge yet little-known memorial to the Pilgrims.

Colorful clay cliffs tower over an unofficial nudist beach on Martha's Vineyard.

The only surviving fragment of the lost Narragansett Pier Casino.

The world's largest covered wagon is piloted by a giant Lincoln lawyer.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A geological mystery on Camelback Mountain.

A bypass decorated with large wooden troll carvings.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

This was once the largest four-sided clock in the world (yes, even bigger than Big Ben).

A place to eat for on-the-run agents and espionage enthusiasts.

Statue dedicated to the star of an old television show.

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

The famous Beatle secretly visited this Illinois town several times to visit his sister.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.