The Scale of the Universe.
A nice animation that lest you zoom in and out from the smallest physically possible distance (the Planck Length of 10^-35 meters) to the estimated size of the known universe. I remember watching an Imax movie with the same basic concept. No matter what, I think it’s just hard for the human mind to comprehend the vastness of the scales involved. Also, who knew giant earthworms were that big 🙂