If you're a fan of the Magic Kingdom and its history then you probably already are well aware of the Western River Expedition, a Pirates-style attraction that was once planned for the park. If not, I'd check out this article on the ride to get up to speed.
Since the ride was never built it has become a bit of a legend among fans of the park - this is an attraction that many die-hard fans would love to see built today. Since that isn't going to happen Disney shared the next best thing at the recent D23 Expo - a virtual ride through of the attraction. Hosted by Imagineers Tony Baxter and Josh Shipley, you can hear the story of what the ride would have been like from the (Western reference pun intended) horse's mouth.
Pretty neat stuff! I missed most of what came out of this year's D23 Expo while I was away, but small things like this really seem to make the event worthwhile.