Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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

A reproduction of earth's many biomes.

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

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

Odd outsider art installations surround a Gold Rush-era ghost town.

A snapshot of the city's fascinating voodoo culture.

A hand-built folk art installation covered with messages of God's love.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Rippling sand dunes frozen in the Arizona rock.

A huge musical instrument played by the ocean.

An emerald-green grotto just a short trip from Austin.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

America's most famous piece of self-built architecture.

A hotel and restaurant serving as the mecca of kitsch.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

Site of a former hidden treehouse in New Orleans.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.