Visit Europe's largest subterranean waterfall, carved by water from the glaciers of the towering peaks surrounding the valley.

The worst road in Colorado is the main gateway to some of its highest peaks.

Photographs of the faces of the town's dead cover the walls of this small Italian church.

In an Emirati park near the Omani border, a reconstructed Bronze Age tomb with impressive reliefs.

The cluster of igloo-like domes forms the remains of an ancient burial ground.

These otherworldly formations were shaped over millions of years by the forces of nature.

The oldest surviving mosque in the UAE has mysterious origins and unusual architecture.

This indoor ski resort has a mountain contained inside a mall.

Whitewashed mosque contains the world's largest carpet.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

An abandoned desert hamlet swallowed up by sand.

This sacred enclave was once considered the religious center of Eastern Polynesia.

Red ocher pictographs survive in this tufa rock shelter on the shore of an ancient lake.

Final resting place of one of Africa's most famous conservationists, murdered by bandits.

The world’s largest permanent desert lake is a UNESCO World Heritage Site.

This beautiful, all-in-one museum, private residence, and bed and breakfast houses a rich collection of African art.

Life and death are on parade at the most reliably perilous site of “the Great Migration.”

Strange sandstone canyon known as the "place broken by itself."

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

A salty cave excavated by elephants and the location of a deadly disease vector.

Just outside of Nairobi lies a large estate surrounded by endangered Rothschild giraffes, who have been fed from the window by Mick Jagger and Walter Cronkite.

Drink and dine in a coral cave that's at least 120,000 years old.

Does this 10-foot-tall statue carved into a rock face depict a king afflicted by a skin condition or a Buddhist figure?