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

A wall of chewing gum moonlights as collective art.

This replica of the Greek structure is in the heart of Nashville.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

Home of Howard Hughes' Spruce Goose.

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

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A man-made island in scenic San Francisco Bay.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

This blowhole is supposedly caused by a trapped monster.

Erotic art covers the walls of the largest ancient pleasure palace.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

Jesus' footprints and the first catacombs in the world.

This Japanese national treasure was originally built in 593.

Secret North Korean passage discovered below the world's most dangerous border.

A chilling monument to Korean patriots who resisted the Japanese occupation.

Home to more than 13,000 pieces of war memorabilia and military equipment.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Home to three historic ships from the age of Vikings.

Whitewashed mosque contains the world's largest carpet.