This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

The only road through the heart of Glacier National Park.

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

This legendary "evil" doll has been haunting the citizens of Key West for over 100 years.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.

An underwater city for the dead.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

The largest retailer of seashells in the world.

A South African bar inside a hollowed out 6,000-year-old Baobab.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

A sculpture for the sun and stars, created by Nancy Holt.

A futuristic temple of light uses prisms and rainbows to create an atmosphere of peace.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A burnt-out motel with priceless Native American artwork in the basement, redeveloped into apartments.

This centuries-old pueblo church houses the body of a Franciscan friar who is said to be a rare "incorruptible" corpse.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.