These azure waters were thought to lead to the Mayan Underworld.

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.

A massive Montreal stadium that has seen nothing but trouble since its inception.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

The biggest museum dedicated to insects in North America, one of the largest in the world.

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

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

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

This strange geological landscape erupts with sudden bursts of water.

A glacier pocked with ice caves and surrounded by rainforests.

A solitary tree has grown up all alone on Lake Wānaka, backdropped by the beautiful Southern Alps.

A perfect turquoise lake colored with glacier dust.

Is there such thing as too many fruit bats? Not anymore.

Nine limestone rock stacks on Australia's "Shipwreck Coast."

A clear example of the process of erosion in action.

Tubing through a cave lit with glowworms is a magical underground experience.

A grotto replicating one of the world's most famed Marian apparitions sits across the ocean from the original.

A pocket of Buenos Aires with an unusually high concentration of psychotherapists.

Bible stories are brought to life with gloriously cartoonish kitsch in this South American theme park.

A vast necropolis where you'll find the elaborate mausoleums of Argentinian tango stars.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.