There’s an elaborate diorama very much like that at the Ringling Museum in Sarasota, Florida, which has a lot about the history of the circus and an extensive art collection.
Reading a lot of Bradbury in my youth I always wondered if the circuses I’d been to were really that different from the ones he wrote about or if he romanticized them. I’m also really sorry that the RBBB just got its first female ringmaster only to close so soon afterward.