Lost subway station nestled beneath Toronto's busy commuter line.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

Secret Swing.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

Explore 10 acres of environmental sculptures.

A gallery of underwater art that can be visited by man and fish alike.

An experimental, automotive replica of Stonehenge.

This is one really big nut.

A clear blue swimming hole with hidden caves, still unexplored.

"I did this all while you were watching TV."

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

A $100,000 tumbleweed decorates an Arizona park and ride that got its priorities a bit tangled.

Outsider Art Community.

Dramatic river bend surrounds a natural red-rocked pedestal.

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

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

An exquisite tunnel of cascading flowers.

One of the world's largest malls has been almost completely empty since its opening.

A canvas of crops grow from vibrant red soil in this terraced farmland.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.