Where manatees are the snowbird vacationers in these balmy Florida springs.

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

Take a drunken tour inside the world's largest known geode.

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

An underwater city for the dead.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

Olfactory delights in San Francisco's Botanical Gardens.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Home to items never before seen by the public.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Mysterious rocks that ring musically when struck.

This shop for all your super spy needs hides an educational secret.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

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

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

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

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

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

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

Rippling sand dunes frozen in the Arizona rock.

This extinct shield volcano is the lightning rod of the Cascades.