sentences:  The Wanamaker Organ in Wanamaker's (now Macy's) department store at 13th and Market Streets in Philadelphia, was substantially enlarged by Rodman Wanamaker in 1924.It is presently the world's largest fully functioning pipe organ (An organ with more pipes but fewer ranks is undergoing restoration at Boardwalk Hall, in Atlantic City, New Jersey).Wanamaker sponsored elaborate recitals in the Grand Court of the Philadelphia store, often featuring Leopold Stokowski and the Philadelphia Orchestra.