This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A lonely beacon, precariously perched atop a remote sliver of rock.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The largest self-built castle in the U.S., six decades in the making.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

Hidden beyond a kitschy giant beetle is this remarkably sprawling collection of preserved insects.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.