Here is a piece in the New York Times about the Wanamaker Organ in the former Wanamaker Department Store (now Macy's) in Philadelphia. I was about to skip out of the article, and noticed this fine shot of the Palazzo Interior of the department store. Thinking it looked familiar, AIA notes the Architect as DH Burnham of Chicago.
Built by the Los Angeles Art Organ Company for the 1904 St. Louis World's Fair, the Wanamaker Organ was designed by renowned organ architect George Ashdown Audsley, author of The Art of Organ-Building. This heroic instrument had more than 10,000 pipes, and its construction was on such a lavish scale that costs soared to $105,000, bankrupting the builder.
This Philadelphia Temple of Commerce may only be matched by DH Burnhams Chicago Temple, Marshall Fields.