This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

The longest living non-clonal organisms on Earth.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A modern day curiosity cabinet.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

An urban laboratory.

What is the Thing?

The sea once considered an ecological wasteland is now called "crown jewel of avian biodiversity" by scientists.

Burping, gurgling geothermal mud pots by the Salton Sea.

The most isolated mailbox in America lets desert travelers record their passing.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

The abandoned train depot now doubles as a well-placed rest stop for those who take the road less traveled.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

The Zalud family experienced a number of tragedies in one decade, giving rise to rumors that the 19th century house is haunted.

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

Quite simply the largest tree in the world (by volume).