The American Playhouse "Fifth of July" is a favorite treasure. I watch it at least once a year. It holds up well, even a PG-13 iteration has the same power.
I'd love to have a few more. My all time favorite I have on VHS -- "Blue Window." A much beloved keepsake. It so captures a particular era, living in Manhattan. That Sunday evening outing that no one wants to attend. I love the play, but I've never seen any production come close to the original company, captured forever in that video.