From old Blue Sky Imagineering, there was a Circus Town planned for where (approx) Big Thunder is now,
with a Discoveryland, as well.
And part of Circus Town was a dark coaster ride called Mickey's Mad House
. Not to be confused
with a Haunted Swing ride, this was basically going to be a (then) Mad Mouse coaster, totally enclosed,
and mainly in black & white
for everything, including the sets, characters and Mickey himself!
I was really hoping that maybe, just maybe, they might have considered this attraction, for one of those
big tents over at the Magic Kingdom's Expansion in WDW. I think it would have fit perfectly into one
of the tents. But it would be a family thrill ride, not for the very small ones.
There's still hope for this to be built!