Here is a typical screen from 70mm's first years in modern times,1955 (Oklahoma!) to about 1982 (Raiders of the Lost Ark). I consider Raiders a roadshow, even though there were no reserved seats, but it was available in 70mm only at first (at least in the San Francisco Bay Area), and only at...
I saw Gone With The Wind in 70mm. Not only was the aspect ratio changed from 1.37:1 to about 2.2:1, cutting off the top or bottom (usually bottom, in my memory) of the image, but the COLOR was horrible. How bad was it? A few years later I was watching some independent film in the little art...
My list would be substantially similar to Ken Koc's. I believe I saw almost all of them, some several times, always in 70mm, starting with Oklahoma! and The Miracle of Todd-AO in 1955. In 1956, Around the World in 80 Days was the most immersive I ever saw, with the possible exception of 2001...