Reaching the "Church in the Sky" requires scaling the cliff face of a sandstone pinnacle with a 650-foot drop.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

The hottest place on the planet.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

These gnarly desert trees produce the prized aromatic resin traded along the ancient incense trail.

Some claim these desert ruins are from the legendary "Atlantis of the Sands."

Within the Saudi Arabian desert lies a 2,000-year-old ghost town made of stone and mud.

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

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

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

A short but powerful waterfall resides amid Colorado’s Great Sand Dunes.

Take a self-guided tour through one of Colorado's most elevated mining districts.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

A fake mine that was made using real mining techniques which is also used as a community center.

This hot dog-shaped diner has moved all around Colorado, but has never been to New York.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

When ecosystems collide in the arid Southwest.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

These cliff and rock formations are made out of Sioux Quartzite.

The final resting place of the Hunkpapa Lakota leader Tatanka Iyotaka, commonly known by the English translation Sitting Bull.

A fitting attraction for the corn capital of the world.