Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

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

A spiritual vortex among the red rocks in Sedona.

This historic national park is covered in the stunning ruins of red rock pueblos.

A self-built castle made by a mysterious man.

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

A smoke stack so large, the Washington Monument could fit inside!

One home in the historic strip hides secret compartments and the ghostly songs of long-gone canaries.

The shortest river in America flows for just 201 feet.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.

The oldest continuously-operating Chinese restaurant in the United States has been in business since 1911.

"Polynesia on the Plains."

The only road through the heart of Glacier National Park.

This off-the-beaten-path abandoned town is a relic of Montana's silver mining boom.

New fungal and bacterial species call this deadly lake home.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This sandstone mansion was the home of two of Oregon's most important pioneers.

Portlandia is the second-largest copper repoussé statue in the United States.

10,000 flowered plants bloom in the City of Roses.