This expansive bridge in the Canadian wilderness was originally just built for friends.

This Elizabethan hedge maze is one of only six in North America.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

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

9,000 square feet of vintage and modern mechanical toys, dioramas & sideshow curiosities.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.

Radioactivity still cause for concern at this urban explorer's paradise.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

Join the circus for a few lessons to learn clowning, acrobatics, and Chinese contortion.

A huge musical instrument played by the ocean.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

This turn of the century masterpiece has a mysterious goaty interloper.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

This shop specializes in oddities and Victorian-inspired wonders.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

Tiki luxury on Nob Hill.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.