For its size, the city of Buffalo, New York, possesses a remarkable number and variety of architectural masterpieces from the late nineteenth and early twentieth centuries: Adler and Sullivan's Prudential building, H.H. Richardson's massive Buffalo State Hospital, Richard Upjohn's St. Paul's Episcopal Cathedral, five Prairie Houses by Frank Lloyd Wright, and buildings by Daniel Burnham, Albert Kahn, and the firms of McKim, Mead and White and Lockwood, Greene and Company, among others.