Mysterious rocks that ring musically when struck.

This museum explores the history of stickers and is home to RePEELed, an exhibit featuring sticker art from around the world.

Willy Wonka would love this weird half-a-home.

Replica of an old Esso filling station, complete with Wayne gravity pump and outhouse.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

A giant cement churn carries the legacy of American resilience, unity, and greed.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

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

This private residence was the template for one of the most beloved television homes of all time.

27-room home built with the fortune of a sugar magnate.

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

A miniature view of the park, caught in time.

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

Reverend Franzo Wayne King administers spiritual enlightenment through the music of the jazz legend.

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

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

Radioactivity still cause for concern at this urban explorer's paradise.

A free, public museum dedicated to the fascinating science of sight.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

Fonts are born and bred here at the oldest letterpress type foundry in the United States.

Half of a house.

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

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Its buzzing collection honors vibrator history.