At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Abandoned silver mine strewn with wrecked and twisted structures.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Dramatic river bend surrounds a natural red-rocked pedestal.

Rippling sand dunes frozen in the Arizona rock.

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

One of the largest, oldest, darkest, quietest motel rooms in the world.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

The Magical World of George Phar Legler.

A reproduction of earth's many biomes.

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

An abandoned meat mecca now serves as an excellent locale for urban exploration.

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

A Biblically notable site over the ruins of an ancient city that is now a protected World Heritage site.

The last operating synagogue in Afghanistan is run by Zablon Simintov, the last remaining Jew in Afghanistan.

Site where Moses may have received the Ten Commandments.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

A battle between nature and architecture in the Cambodian jungle.