On the side of a remote mountain, a stone face bearing an inscription of mysterious origin.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Mysterious glowing orbs float through the desert night.

Ghost town with a beer-drinking goat for mayor.

A US military accident created the legends behind this Mexican version of the Bermuda Triangle.

A gargantuan crystal kingdom.

The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

Hunt for buried treasure in Nova Scotia.

Eastern Canada's ocean playground.

A tiny, picturesque island, where cows and wild horses wander around the houses.

An ancient Viking village in North America that predates Columbus by 500 years.

Beautiful mostly-abandoned town only accessible by sea-worthy boat or plane.

The world's largest dark sky preserve is a Canadian park established to preserve the country's last wood bison.

Roadside collection of 65,000 signs.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Home of an evil witch famous within southern folklore.

The world's longest known cave system.

Enormous lake at the bottom of a unique cave system.

This structure among the trees was the result of divine inspiration.

America's smallest "national forest" has only 33 trees.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.