A crumbling hospital from the 1850s on Roosevelt Island.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

This crumbling industrial fortress has attracted daredevils, filmmakers, and historians.

Every year, the colorful murals of Montreal get a complete makeover.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

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

George Lucas donated this park to honor the birthplace of his two biggest movie franchises.

A crumbling Beaux Arts monument to the Bay Area's age of rail.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

340 bicycles, 65 feet high.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

This one-block alleyway is stuffed with street art that is colorful, cultural, and intensely political.

The space-age building is home to one of the few remaining rotating restaurants in America, and the only one that inspired a 1980s sitcom.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

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

A tribute to the life and work of the beloved "Peanuts" cartoonist.

A grove of "candelabra redwoods" deep in California's Lost Coast.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

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

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

San Francisco's newly reopened hands-on science museum.