This ruined castle is said to be the legendary keep of a Viking princess.

An ancient city hidden in the heart of the Sierra Nevada mountains.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

Legend says a primate-like cryptid prowls this otherworldy sliver of the Louisiana bayou.

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

Stroll through a wonderland of stupendous moss-covered trees.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This towering volcanic plug stands out among the dramatic formations that dot this otherworldly desert valley.

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

This iconic hilltop church doubled as a lighthouse in the 19th century, guiding ships into the port of Valparaíso.

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

This subterranean passage reveals the city's mining history as well as its legendary terrors.

Mountain of unimaginable riches that bankrolled the Spanish Empire, complete with its own underworld god.

An ancient Incan convent on Lake Titicaca's Island of the Moon.

What was once a unique system of urban elevators is turning into a mechanical ruin.

The celebrity luchadores of La Paz are tough ladies in traditional petticoats and braids.

Once swallowed by flood waters, this village has emerged as an eerie shadow of its former self.

A toxic lake near a volcanic caldera that is home to flamingos and other life.

A wooden dock art installation on Chiloé Island taps into the island's indigenous mythology.

This everlasting lightning storm may be the world's largest generator of ozone.

Ruins of the laboratory where a mysterious doctor invented an embalming fluid and stored his mummies.

A market for witches is hidden within a train station.

This cave system allegedly holds the "metallic library" of a lost ancient civilization.