The Ferry Building - along the Embarcadero at the bottom of the Financial District, in the shadow of the Bay Bridge. Great restaurants (Hog Island Oyster Co, Slanted Door) and a phenomenal Farmers Market.
Golden Gate Bridge, San Francisco/Oakland, CA. My dad sailed home from WWII after 4 years in the So. Pacific & said that the Golden Gate Bridge again was one of the most beautiful things he'd ever seen.