The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

Order scoops of pandan, lychee, and black sesame at this family-run institution.

The intriguing personal collection of a professional demon-chaser.

A fifth-century temple improbably built into the side of a cliff.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Tubing through a cave lit with glowworms is a magical underground experience.

A heavenly experience, right here on Terra Firma.

A Hawaiian stairway to heaven—that you can't climb.

A beautiful geyser under environmental threat.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Become a prohibition rebel.

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

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

The most alien-looking place on Earth.

Pompeii's less famous neighbor is still revealing her secrets.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

Furniture tries to escape an abandoned building in San Francisco.

Museum preserving torture methods from the past.