A 115-year-old restored German dining hall awaits those who venture beneath the Minnesota State Capitol.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

An abandoned town is hidden in Great Smoky Mountains National Park.

When he found his hometown was no more, Lowell Davis decided to recreate a "new" ghost town from scratch.

This sculpture gallery is home to magnificent beasts made of scrap metal and found objects.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

America's smallest town is run by its single citizen/mayor/librarian/bartender.

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

When an ancient supervolcano erupted, some of Nebraska's prehistoric animals were forever preserved in ash.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

The ruins of a 19th century shelter run by the Independent Order of Odd Fellows.

A subterranean haunt where wine and homemade biscottis are always on the menu.

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

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

Giant granite rocks standing end-to-end like a train of circus elephants.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.

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

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

Less a museum than a bizarre fantasy world created by artists and engineers.

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.

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

A cave 150 feet beneath Kansas City is the perfect climate for growing 10,000 delicate orchids.