The Racine Zoo was established in 1923 at Racine's Island Park. Its first home, however, was quite temporary and in 1925 the Zoo moved to its present 28-acre location on the shores of Lake Michigan. The Racine Zoological Society (RZS) was incorporated in 1924 as a financial support organization for the Zoo. The Racine Zoo is open year-round. The iconic building, the Vanishing Kingdom building, began in 1936 as a WPA project and finished in 1939. That structure still stands today. The Racine Zoo is one of only 225 zoos accredited by the Association of Zoos and Aquariums.