Circus World Museum
http://www.wisconsinhistory.org/circusworld/about.asp
Wisconsin Historical Society's Circus World Museum seeks to foster appreciation in role the circus has played in American life. It is the world's foremost research facility for circus history, and documents the American circus from its inception in 1793 to the present. During the summer the museum conducts live circus performances and demonstrations.
Referenced in:
"The Greatest Show on Earth: Then and Now"