A cyclorama is a panoramic painting on the inside of a cylindrical platform, designed to provide a viewer standing in the middle of the cylinder with a 360° view of the painting. The intended effect is to make a viewer, surrounded by the panoramic image, feel as if they were standing in the midst of an historic event or famous place.
"Cyclorama" can also refer to the building designed to show the panoramic painting (pictured).
Read more about Cyclorama: Background, Ben-Hur Dramatisation, Surviving Examples