A Turkish monastery tucked into a cliff wall.

A marvel of Byzantine engineering under the streets of Istanbul.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

An ancient iron pillar in Delhi that seems to be rustproof.

Temples adorned with intricate, erotic sculptures make up one of the "seven wonders" of India.

An extraordinary "City of Caves" carved from solid stone.

The remains of what was, not so long ago, the world's largest city.

Visit this odd display of indigenous style in Argentine wine country.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Death road of Bolivia.

A seemingly endless landscape of pure salt stretches far across Bolivia.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

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

Huge stone depressions which may have acted as an Incan agricultural experiment.

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

An inspired museum dedicated to the patron saint of enslaved people, inside the cloisters where he lived and died.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

A dangling church built over a Colombian gorge.

Home of the "true" equator.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

An Ecuadorian haberdashery that sets the record straight about the so-called "Panama" hat.

This cavernous swimming spot doubles as a home to the largest known colony of bats in Central Asia.