This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Colorado Boulevard’s historic bookstore, operating since the bustling city of Pasadena was merely some orange groves and a few ostrich farms.

Where the rich wintered in Pasadena.

The famous blue house from the classic horror film "Halloween" is now a local landmark.

This giant shopping mall still holds signs of its automotive past.

From the Difference Engine to the Cray-1, all under one roof.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

This controversial depiction of the "Founder of California" looks as though it was sculpted from mashed potatoes.

Concrete strongholds stand guard over the Golden Gate.

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

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

Depicting scenes of everyday life - and specific individuals - in Great Depression era San Francisco.

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

A man-made island in scenic San Francisco Bay.

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.

San Francisco's newly reopened hands-on science museum.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

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

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

Only hotel where you can legally launder money.

Chevron maintains one “Standard” brand station per state so it doesn’t lose the trademark.