World-famous for very good reasons, designed by Chicago chief engineer Joseph P. Strauss and consulting architect Irving F. Morrow, it opened in 1937. This ever-present Art Deco wonder is an unforgettable experience, no matter how many times you visit. It took 52 months to design and construct. I recommend a biking over the bridge from San Francisco to Sausilito. You can then take a ferry back to the City.