The 2500-foot mechanical sidewalk under construction at the 1893 Columbian Exposition in Chicago. See "A:Admission Tickets :: The Pier Movable Sidewalk".
The walkway was the first of its kind and ran from a casino on shore out to the boats at the end of a pier. Visitors arriving by ferry from downtown Chicago could step onto this walkway and glide (either seated or standing) to the fairgrounds at the other end. The moving sidewalk served as inspiration for a similar technology at the 1900 World's Fair in Paris.