MOMA Showcases Century-Old IMAX Films
The Museum of Modern Art has a short doc on YouTube called The IMAX of silent movies. One company back then was shooting 68 mm film at 30fps. The short vignettes are stunning.
Remarkably, this was from the earliest days of silent film at the end of the nineteenth century.
This is the link: https://www.moma.org/magazine/articles/70