Who remembers Hanna-Barbera Land? Bruce Bushman was hired at some point in the late 60's or early 70's to do some concept drawings for a possible Hanna-Barbera Land. These were recently auctioned on ebay by the Howard Lowery Gallery. It is pretty amazing to see a Flintstones Freeway, a ride based around Space Ghost and even a Winsome Witch Haunted House.
Other parks may have had Hanna Barbera areas but we are yet to see a full blown HB park. Maybe someday.