In rural Iowa, an imported 19th-century windmill overlooks an unlikely enclave of Danish culture.

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

Other-worldly rock formations and ancient fossils abound in this unique stretch of Nebraska badlands.

An idle pastime becomes a record holder in Boys Town, Nebraska.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.

Native Americans built this circle of stones, which was used to predict astronomical events.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

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

This is not your typical jungle gym.

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

The first artificial white water river course in North America cuts right through an Indiana city.

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

The longest navigable underground river in the United States is home to countless blind and albino animals.

A hotel with a rich Wild West history of miners and bootleggers.

The home of a formerly enslaved man who went on to become a prospector, entrepreneur, and activist for Black rights.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.

Abandoned silver mine strewn with wrecked and twisted structures.

A museum documents the development of the invention that tamed the Wild West.

The two-cell building in Nebraska was briefly owned by a teenage boy and then a Hollywood dummy.

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

A small town garden is dedicated to a psychic dog with the most soulful eyes.