Cole Younger's site is filled with concept art from Imagineering- but not just anything. It's stuffed with never built concepts from Disney projects around the world. Descriptions, histories, and galleries full of the stuff we love.
Heard of the Magic Kingdom's long rumored Fire Mountain? See it for yourself- the art is right here. What about the infamous Dick Tracy's Crimestoppers for Disney-MGM Studios? Gotcha here.
Cole has even included my photo of Plectu's Intergalactic Revue, a Disneyland proposed replacement for the Carousel of Progress. I snapped the shot in 1990 of a billboard advertising the soon to arrive attraction!
All said, go check out the site! You can spend hours there- I did!
(Art copyright The Walt Disney Company.)