The underground sanctuary of a mysterious ancient cult.

A 16th-century horror show built in a lovely Italian garden.

This stunning Brazilian library contains the largest collection of Portuguese texts outside of Portugal itself.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

The hallucinogenic center of the ancient world.

This legendary city has been a tourist attraction for centuries.

This stunning mass of ice spans 121 square miles and is still growing.

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

The outside of this exposed Moche pyramid is covered with striking colorful adobe friezes.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Honor one of Argentina's most prolific writers at his historic home.

The depictions of slaughter are surprisingly detailed at this mysterious ancient site.

Hundreds of mummies in a silent room, some with eerily pained expressions preserved on their faces.

The large collection of pre-Columbian pottery might make you blush.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

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

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

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

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

Bolivia's needle-like rock formations.

This devil-dancing ceremony now celebrates a miraculous image of the Virgin Mary that appeared to a modern-day Robin Hood in a mineshaft.

Enchanting cave with a river crashing through the roof.

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.