There are some fameous posters of Disneyland Areas or specific rides, such as a Haunted Mansion... It's the Mansion on a Green Background with the three hitchhiking ghosts in the forground.
I think they are also in the Tunnels under the Main Street Station.
So now that I have told you what they are.... I cannot find any good pictures or high quality scans of them anywhere on the net.
I am sure they must be out there.
Can anyone help me with a link?