The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

Eighty million natural history specimens call this gargantuan museum home.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

The world's brightest bioluminescent bay.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

The world's second largest single-dish radio telescope, once used to contact E.T.

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

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

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

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

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

Beach instrument turned bed and breakfast.

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

An unexpected desert oasis in South America.

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

This stone complex marks the urban center of a lost civilization.

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

This one-time health resort was used by aristocrats around the world.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

A whimsical bridge adorned with decorative dragons.