Eons old volcanic activity created one of the most stunning rock formations in the United States.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Inhospitable caverns just beneath this island paradise offer insights into alien worlds.

A geological bull's-eye visible from outer space.

The kind of mixed-up place that drives archaeologists crazy.

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

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

The highest point in Nevada had to be decided by court order after California tried to claim it as their own.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The first declared National Monument in the United States.

The echoes of a railroad town that solemnly mark the end of the line.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

These jagged limestone blades cut out through the canopy of the jungles of Borneo.

A popular rock that acted as a waymarker for American pioneers.

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

This famous Nevada gold mine, once a hotbed of Wild West shenanigans, is now open for tours.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.