The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Did Inca children also slide down these smooth rocky slopes above Cusco?

The illuminated falls are a gem in North Cascades National Park.

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

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

This old mining town, deep in the California desert, has a year-round population of one.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

Smooth basaltic rocks tell a tale of ancient glacial waterfalls.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

The rocks in this arid basin leave trails of movement behind them.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.

This amazingly preserved Gold Rush town is a historian's dream.