Where the lovelorn find a home for their sentimental keepsakes.

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

Concrete strongholds stand guard over the Golden Gate.

'Cause the fence start shaking, the earth was quaking.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

The southernmost outpost of the Russian Empire in colonial America.

A man-made island in scenic San Francisco Bay.

The miraculous hydrant that saved the Mission District in 1906.

Commonly referred to as the most photographed Victorian home in the United States.

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

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

An essential stop before plundering, BYO Cutlass.

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

A trash dump made beautiful by nature's power.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

Come for the waffles, stay for more waffles.

A bit of retro transportation flair preserved in the world's largest department store.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A historic hill of tall tales, with one rather special tree.

The commemorative stone column conceals a secret laboratory.

The first archaeological site discovered by aerial photography.