This naturally-sourced hot spring is now home to a clothing-optional resort.

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

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

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

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

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

A technicolor place of worship for Elevationists.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

This 3,800-year-old site contains markers used to study the movement of the sun and moon and create a lunar calendar.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The world's largest bioluminescent area was undiscovered by science until 2005.

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

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Australian Lake set aglow by Noctiluca Scintillans.

Bioluminescent firefly squid light up this Japanese fishing port.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

Once the path of a railway tunnel, now home to thousands of glowing insects.

Bioluminescence in the reefs of the Maldives causes the sea to glow like a starry night sky.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

A more than 260-year-old crypt built on Boston's oldest English burial ground.

This ambitious father and son team reigned supreme over the North End, and witches, for many years.