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

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

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Abandoned bull fighting ring, slowly falling apart in Uruguay.

This maximum-security prison was abandoned to make way for a national park.

Colombia’s only monument erected to mark the end of slavery in the former Republic of New Granada.

The (usually) serene burial place of the world's most notorious drug lord.

A museum built around a bus-sized fossil on the side of the highway.

No one knows for sure why this town's dead refuse to rot.

Ripped apart by a bomb in 1993, the shell of Pablo Escobar's infamous vacation house still stands.

Storied crypts fill the most famous cemetery in Colombia.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

Cathedral carved out of salt, located a mile below the earth's surface.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

This picturesque mansion has gone from opulent ruin to nature museum.

A dangling church built over a Colombian gorge.

Ruins of the laboratory where a mysterious doctor invented an embalming fluid and stored his mummies.

A town church once nearly submerged by the damming of a river is now hauntingly visible as the water recedes.

One of the best-preserved impact craters on the planet is located in the middle of the Sahara Desert.

Classical ruins that remember ancient Rome's presence in Africa.