Towering basalt columns, a creation of fire and ice.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

The first spinning jail built in the United States is the only one that still turns.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

This library and museum is dedicated to the life and literature of the Indianapolis native author.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

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

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

Gold Rush-era tombstones line the park's paths.

Here lies Lilly E. Gray, an alleged "victim of the beast," but the reason long remained a mystery.

A memorial to the unknown and unheralded men and women of the Cold War military and intelligence services.

This small collection of rare books was uniquely locked up for safe keeping.

A winding path built in secret on the edge of the continent.

Venue for strange sideshow displays and musical acts.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

A mysterious light of unknown origin on the backroads of Missouri.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

A series of eerie metal stick figures are spread out over four square miles on the bed of a huge salt lake in the Australian Outback.

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

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.