All of the Rick Sebak videos are very interesting. All of his Pittsburgh History series are really neat (especially "Kennywood Memories" and "Things That Aren't There Anymore").
The program was called "Great Old Amusement Parks," and if you're a fan of classic amusement parks (like me), then this program is for you.
I missed the program the first time it aired, so when I was in Station Square in downtown Pittsburgh, I bought the video :).
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Kennywood Insider's Guide
http://kennywood.coaster-mania.com/