A geological mystery on Camelback Mountain.

Take a monster truck tour around an ostrich farm in the middle of the desert.

Giant telescope mirrors built in a spinning furnace under a college football stadium.

Legend says train robbers stashed their gold within the depths of this unusual cave.

This giant steer-skull edifice refuses to die.

One of the largest open-pit copper mining operations in the entire country.

A reproduction of earth's many biomes.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

A museum and tribute to a brave profession.

The remains of this rugged homestead ranch offer a brief glimpse into a bygone era.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

Abandoned hotel with adjacent lake and golf course.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

Formerly secret, precariously perched boulders.

A rugged lava field dotted with molds of the ancient pines that were growing when the volcano erupted.

This large maar crater in Oregon is the bigger brother to Hole in the Ground.

A volcanic fissure over two miles long and up to 70 feet deep.

This Old West eatery along America's Loneliest Road was originally a stop on the Pony Express.