Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

The palace of the King of Kings, burned by Alexander the Great.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

Pivotal home of Nobel Prize winner Pablo Neruda.

Locals visit this abandoned train tunnel where a man took his own life to ask favors of his spirit.

How a lunch counter in Chile became a shrine to the 42nd president of the United States

One of the largest ancient geoglyphs in the world is a tall desert god used for predicting the weather.

The “City of Stairs” sits high in the Andes, above the world’s largest underground copper mine.

What was once a unique system of urban elevators is turning into a mechanical ruin.

Thought to be the only herd of feral horses in Africa and one of the most isolated populations in the world.

This deceptively beautiful island was once home to a German concentration camp and known as "Death Island."

A rare cluster of alien-like plants grows along a dusty highway.

Road signs in Namibia mark the location of one of the five major circles of latitude.

Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

The remains of diamond fever taken over by the desert.

The highest monastery in the world operates a tiny guesthouse with doors open to all.