See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

Most-visited and most-photographed slot canyon in the American Southwest.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

The remains of a enormous earthen figure of unknown origins cuts across a rural Wisconsin road.

A forgotten Cold War relic hidden in the outskirts of a Wisconsin city.

A large circus museum with summer performances.

Statue dedicated to the star of an old television show.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

A unique botanical garden housed in three giant geodesic domes.

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

This striking art museum holds an amazing series of curiosity cabinets.

This cave holds a surprisingly colorful variety of geological oddities.

A bizarre house filled with an astounding array of collections.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

A lush oasis full of vibrant plants and striking geometric displays.

Curious rock formations in a tiny Kansas state park.

One of the few working locomotive roundhouses in the United States.

This lovely public park has an intriguing past and unique wooden bridges made of concrete.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

A six-story-tall golden pyramid, surrounded by a moat.

This former nursery supplied plants for the creation of Chicago's largest park.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.