The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

For a century, the tallest building in Tasmania was a tower built to manufacture ammunition.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

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

A man-made island in scenic San Francisco Bay.

Concrete strongholds stand guard over the Golden Gate.

Early prototype for Frank Lloyd Wright's Guggenheim.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

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

The miraculous hydrant that saved the Mission District in 1906.

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

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

This shop specializes in oddities and Victorian-inspired wonders.

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

The Flatiron Building's storied West Coast cousin is a lot more into religion.

The platform atop this verdant volcano was built with the help of a royal elephant.

The glacier tucked within a New Zealand rainforest.

New Zealand's epic shrine to all things puzzling.

A small, but award-winning beach known for its literally spotless reputation.

The only pollutant in the clear blue water is sunscreen.

This extraordinary geological oddity resembles human-made pavement.

One of the first big sculptures anywhere in Australia.

Nine limestone rock stacks on Australia's "Shipwreck Coast."