An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

The only castle in North America to ever house European sovereigns.

The headquarters of a secretive order is also a beautifully-designed park.

One of the ghostly stops along Route 66.

Mosaics, storks, and brothels—this ancient city has it all.

The best-preserved Roman small town in North Africa.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

A hacienda that features all things uniquely Yucatán.

The ruins of an ancient Mayan city, beautifully preserved and only accessible by boat.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

The world's oldest known salt mine.

Hear the quietest sound from across the dome.

A seemingly simple canyon that was the backdrop to a number of famous movies.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

Bohemian paradise covered in majestic forests.

2300-year-old Roman road connecting the empire.

Mysterious glowing orbs float through the desert night.

The ghostly remains of an accidental sea.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

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

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

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

Traditional 11th-century outdoor tannery.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.