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

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

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

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

A 300-ship graveyard, with a few still visible at low tide.

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

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Quite simply the largest tree in the world (by volume).

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

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

A massive volcanic plug is now a protected area that hosts a number of bird species.

The unbelievably opulent home built for an infamous newspaperman.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

This pharmacist and his patient greet visitors to the National Community Pharmacists Association.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

World Trade Center memorial likened to a woman's sexual organ.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Tucked in the back of this amazing antique store is an important piece of medical history.

The inventor of the Coney Island hot dog rests in a grand mausoleum in Brooklyn.