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

A massive ultra-modern church presents a science-fiction view of Catholicism's inclusive future.

The remains of a ruined mansion memorialize the 1906 earthquake.

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

A monumental cross hides in the trees in Golden Gate Park.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

Feed it cash, get your very own gold bar.

Whitewashed mosque contains the world's largest carpet.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

The world’s largest LED display, built over an F1 race circuit.

Billed as the "largest natural flower garden in the world" this Middle Eastern show field has little competition at 45 million flowers.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This artificial archipelago was supposed to resemble a map of the world.

An abandoned water sports stadium that has become a haven for graffiti and decay.

What was to be the world's most secure Cold War document vault ended up as just a few shallow caves.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

Disney World's very first waterpark is now an abandoned ruin being reclaimed by the swamp.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Canada shows its hockey pride with a giant stick.

Nestled near the mountains of western Canada resides this behemoth earth mover.

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

While these wooden totems bear a striking resemblance to First Nations artwork of British Columbia, their actual origins lay on the opposite side of the Pacific Ocean.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.