This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

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

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

Entering this curiosity shop is like stepping into a mad scientist's lab.

Post office plaque commemorates local resistance to a cult invasion.

The first North American landing spot for James Cook on his third voyage of discovery in the Pacific.

This perfectly preserved Chinese medicine shop was untouched for decades before being reopened as a museum.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

Only known mainland rookery of the threatened Stellar sea lion.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The seamy, underground secrets of Portland's criminal past.

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

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

On the Oregon coast there is a natural hole that seems to be draining the sea.

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

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

The ravine where Jesse James supposedly performed an impossible jump to evade capture.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.