A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

An island graveyard with spectacular views of the Caribbean.

One of Mexico's least-visited archaeological sites is tucked away inside a theme park.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

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

A museum dedicated to the German scientist who revealed the significance of the mysterious Peruvian Nazca Lines.

This 16th-century monastery was founded to cloister the daughters of wealthy local families.

A Christian monastery stands on what was once a holy Incan temple.

Mystic Incan rock piles three miles above sea level.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

An Inca spa, military outpost or maybe… both?

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

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

An unexpected desert oasis in South America.

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

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

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.