779131 Wonderland, Kennywood Park, near Pittsburgh, c.1906 (b/w photo) by Detroit Publishing Co. (1880-1920); Private Collection; (add.info.: Kennywood is an amusement park in West Mifflin, Pennsylvania opened on May 30, 1899 as a trolley park attraction at the end of the Mellon family\'s Monongahela Street Railway. Wonderland housed a scenic railway and a steeplechase ride so the building became known as the Steeplechase Arena. It also housed a "pavilion of fun".); American, out of copyright.