The original wagon, built in 1902 before Ringling Bros. purchased the Barnum & Bailey Circus, is 28 feet long and stands 13 feet tall when measured to the top of the center flag.

About 60 people are registered to display small-scale circus models. Many built the various miniature wagons, tents, animals and ringleaders themselves.

The show will be held Friday through Sunday, between 9 a.m. and 6 p.m. Regular Circus World admission fees include all the model events and displays.

The miniature calliope wagon in the animated parade at the Museum of Science and Industry's circus exhibit. 2010 photo. Adam Harrington/CBS 2 ...