Although the topic is about unusual and unique dark rides, I suppose we can include Fun Houses (?)
A unique fun house that comes to mind is one that was built in 1997 for Fiesta Shows. It's called, "EARTHQUAKE".
I never got to see the completed project in person. It was built in-house by Fiesta Shows, or so that's what I was told when I saw it being built in Feb. of 1997 at Fiesta Shows lot in Gibsonton, FL. However, Fiesta Shows' website mentions Southern as having involvement with it.
When I saw it in Florida in 1997, it was just being completed. The front wasn't painted on it yet, however I was told it was going to be turned over to Bill Browning to paint the front on it.
I wrote a short article about it that appeared in the April 1997 issue of Carousel Magazine.
The headline was, "Earthquake Hits Gibtown" (I liked that attention-grabbing headline I came up with).
Here are some excerpts from the article...
"An EARTHQUAKE has emerged in Gibsonton, Florida over the winter and is predicted to be a mover and shaker on Fiesta Shows this season.
This spring, New Hampshire based Fiesta Shows will debut a new fun house attraction that is sure to be a crowd stopper on the midway.
Themed "EARTHQUAKE", the one-trailer, double-deck unit is framed out to resemble a city skyline of skyscrapers and buildings in the midst of an active earthquake.
Portions of background scenery are hinged at the base and motorized to move forward and backward, giving the illusion of buildings swaying. Other rooms and walkways rock from side to side.
The "EARTHQUAKE" sign, built to resemble a huge slab supported by columns on each side, is animated to simulate the columns collapsing and the slab breaking in half.
Show owner Eugene Dean pointed out that to add to the realism, the attraction will also feature "some interesting sound and lighting effects". For example one room will have strobe lighting.
I assume Fiesta Shows still has this fun house as there are photos of it on their website...
http://fiestashows.com/rides/byid/387
"Don't forget to be half fair and give a little credit to the small concessionaire"