An optical illusion found amid a logged redwood forest.

A 140-year-old castle with underground caves hidden in San Francisco.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

A monument to the art of slicing people open.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

A sacred lake composed of over 300 separate pools of highly concentrated minerals.

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

Abortion, prohibition, religion, war, and fear all play a part in the history of this idiosyncratic Pacifica castle.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

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

Miniature art that tells an enormous story.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

A hands-on traveling collection of the innovative devices of yesteryear.

Beautiful natural falls where Satan once ruined a pot of beans.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

A semi-scholarly approach to sex.

A staggering collection of photographs depicting medical, social, and historical change.

Ukraine's oldest operating pharmacy now offers guests a fascinating walk through apothecary history.