<P> The fair 's 1,200 - acre ( 4.9 km ) site , designed by George Kessler , was located at the present - day grounds of Forest Park and on the campus of Washington University , and was the largest fair ( in area ) to date . There were over 1,500 buildings , connected by some 75 miles ( 121 km ) of roads and walkways . It was said to be impossible to give even a hurried glance at everything in less than a week . The Palace of Agriculture alone covered some 20 acres ( 81,000 m ) . </P>
where was the st louis world fair held
Forest Park and on the campus of Washington University