“Vertigo”,”Shadow of a Doubt” and “The Birds” were all movies directed by Alfred Hitchcock and filmed partly in the City. Four times a month SF City Guides holds an Alfred Hitchcock Walking Tour led by well informed cinema guides. The next one is on Sunday at 11am starting at Huntington Park on Nob Hill and ending in Union Square with a steep downhill walk. It’s a rich opportunity for seniors to remember the City they grew up in back in the 50’s. Enhance the tour by re-seeing “Vertigo’ before you go. Free.