The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The first declared National Monument in the United States.

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

An experimental, automotive replica of Stonehenge.

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

A fascinating collection of art made from petrified wood and fossils by two octogenarian twin brothers.

A museum chronicling pioneer life constructed over Interstate 80.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

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

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

A Winnebago Tribe collection featuring arrowheads, artwork, and a mysterious rock carving.

Underneath downtown Lincoln resides a network of caves that was also the city's first brewery.

Home to the world's largest quilt collection dating from the 1600s through today.

This once rural mansion now sits in the heart of the city.

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

The World's Largest Bull.

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

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

Most comprehensive museum in America devoted to one ethnic group.

Largest gathering of hobos in the country has been meeting annually since 1900.

One man's quest to save his town with a trail of record-breaking sculptures.

This simple badlands butte is the highest point in North Dakota and may be the only high point to charge admission.

The ruins of Theodore Roosevelt's beloved ranch stand in a forgotten corner of a national park named after him.