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."

Ancient pueblos built into the base of a natural canyon wall.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A tunnel with windows, so you don't miss out on the impressive views.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Found in the waddenzee, this propeller has been put on public display as a reminder of the Second World War.

Dedicated to the history of the 1,000 nuclear missiles that once covered the Great Plains.

Home of a French nobleman's short-lived attempt at raising cattle in the Badlands of North Dakota.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The first declared National Monument in the United States.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

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

This rustic old building is said to be the most photographed barn in America.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

World's largest Christmas store.

Perched atop a brick smokestack, this enormous lug nut symbolizes the local minor league baseball team.

The plants form a living library and laboratory for researchers and students at Michigan State University.

This experiment in the lifespan of seeds will take a century before it is complete.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

A statue honors the genius who allegedly first took a meatball and made it into a hamburger.

This is not your typical jungle gym.