The oldest alley in San Francisco is paved with a reminder of the city's original shoreline.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

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

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.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

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

Perfect your fly fishing technique on their practice ponds.

This partially buried wreck is one of the most complete of its kind but is only revealed when the sea allows.

This historic roadhouse has many tales to tell of San Francisco's early history.

This Alamo Square mansion is rumored to have hosted satanic rituals and other occult practices.

The remnants of a failed socialist commune can still be found just off a California highway.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

A clear blue swimming hole with hidden caves, still unexplored.

This water tower slanted at an uncomfortable angle off the old Route 66 was an ingenious marketing ploy.

Where hills of dirt conceal the burial ground of one of the most powerful ancient Native American societies.

Claims to be the "World's Highest Hill."

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

This replica of the Greek structure is in the heart of Nashville.

Walk the whole Mississippi River!

This award-winning men's bathroom was just too beautiful to not allow women to see.

Furniture tries to escape an abandoned building in San Francisco.

Floating man-made island and upscale restaurant.

Once the site of speeding horses, now home to picnickers and public concerts.