A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

The large collection of pre-Columbian pottery might make you blush.

This stone complex marks the urban center of a lost civilization.

An enchanting tunnel of cypress trees leads to an old morse code station still used today.

This abandoned boat was left in place thanks to its rotting beauty.

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

Art in the form of a winding, man made crack in stone.

Condemned US Navy seaplane control tower turned officers’ club sits atop Yerba Buena Island.

An enormous illuminated figure dances on the Las Vegas strip.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

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

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

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

A famous alternative culture epicenter and where Joplin serenaded young hippies.

A man-made island in scenic San Francisco Bay.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

Barely visible foundations remain where Stow Lake’s “observatory” once welcomed visitors.

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

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

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

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

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

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