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

One of the largest Masonic temples in the world, created at the height of the oil boom in ostentatious style.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

The United States's largest hand-dug well is topped with a state-of-the-art museum.

A sculpture of a giant man escaping from the depths of the Earth.

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

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

A single artist is behind these large-scale models made of hundreds of thousands of two-inch wooden matchsticks.

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

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

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

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

The “American Gothic" artist's largest works hang in an Iowa State University library.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

An outsider art studio that created a piece of work so popular they had to turn mainstream.

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

Also known as the Cathedral of the Plains, this church holds the distinction of being one of the "8 Wonders of Kansas."

Twenty-year effort to raise a castle using tools and techniques from the 13th century is now abandoned in the Arkansas woods.

These massive mitts are made of 30 tons of devotional bronze.

Its incredible collection preserves 170 years of sewing machine history.

The collection is housed in an exquisite mansion that makes you feel like you've been transported to an Italian villa.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

One of the best examples of Art Deco architecture in the United States.

A former chicken restaurant that doubled as a speakeasy is now a quirky home full of wonderfully strange traditions.