A reproduction of earth's many biomes.

This former stomping grounds of the most eminent astronomers of the early 20th century.

Site of the greatest known waterfall that ever existed.

Explore more than 130,000 new and used books in the "world's largest outdoor bookstore."

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

A lawless town deep in Death Valley was famous for its riches and death rate.

This ramshackle ghost town is comprised of mining-era buildings collected from around the region.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

Opinions differ as to whether this Arizona tree was actually used as a Wild West jail, but that hasn't stopped the town from capitalizing on it.

A Wild West jailhouse that slid down the mountainside.

The final resting place of the living embodiment of the famous Forest Service symbol.

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

The easternmost town in Alaska can only be accessed from Canada.

A classic advertising icon immortalized in regal bronze.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

The only thing stranger than stumbling onto these philosophical musings is the story of the homesteader who created them.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Some of the Old West's most notorious outlaws frequented this mining town.

Collection of vintage trailers double as hotel rooms.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Colorful Native American paintings are hidden within this small cavern.

The fossilized remains of ancient California redwoods.

An extensive collection of ancient Egyptian artifacts and mummies.