Drink a Guinness under the wings of Reagan's retired Air Force One in his presidential library.

A Mysterious Masonic tomb in San Luis Obispo.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

Visible below the waves are memorials to the city's Gold Rush dead.

The only visible piece of San Francisco's most famous shipwreck.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

The Laureates here get something even more coveted than a Nobel Prize: free parking for life.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

This residential door allows San Francisco muggles a glimpse at the wizarding world.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

The legendary statue-hating superintendent of Golden Gate Park is honored with... a statue.

One of few lasting examples of the brief octagon craze that developed into folly.

Olfactory delights in San Francisco's Botanical Gardens.

The remains of a 12th-century chapter house in Golden Gate Park.

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

A private home built to resemble the shape of a microscopic creature.

Faceless white figures loom over the city from the rooftop.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

A shining, cold, black organ lies in San Francisco's financial district.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

A speck of nature and art in one of San Francisco’s most notorious neighborhoods.

The first fresco Diego Rivera painted in the United States can be found in the former San Francisco Stock Exchange.

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