An eerie natural formation that looks right back at you.

Where a staggering 747 ships were constructed during World War II.

Concrete strongholds stand guard over the Golden Gate.

An art collective teaching the more fiery, metal-y art forms.

Ride on a fully-restored Nike nuclear-tipped missile elevator from the Cold War.

This lighthouse has been guiding shipping into the Golden Gate since before the American Civil War.

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

A hidden gem, named after a San Franciscan icon, offers spectacular views of the Pacific Ocean.

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

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

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

A man-made island in scenic San Francisco Bay.

Guns that have been defending San Francisco since 1904.

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

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Golden Gate Park's historic collection of plants.

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

A psychedelic labyrinth on the San Francisco bay.

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

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

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

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.