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

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

A psychedelic labyrinth on the San Francisco bay.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Rippling sand dunes frozen in the Arizona rock.

World's largest collection of serial killer artwork and other macabre exhibits.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A huge musical instrument played by the ocean.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Eclectic collection of rare and beautiful stones in a historic home.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

The history of funerals and funerary customs.

A museum dedicated to man's boldest venture.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

A big museum full of little worlds.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.