Rippling sand dunes frozen in the Arizona rock.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

White llama terraces dazzle in Peru's "other Machu Picchu."

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The Uros people live on floating reed islands in lake Titicaca.

An explosion of natural color known as "the river that ran away from paradise."

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