Atlantic City

For many years, the largest working pipe organ in the world was the Wanamaker organ in the Macy's in Philadelphia. Now, thanks to restoration efforts, you must move northeast a few miles to find the largest. The massive pipe organ at Atlantic City, with 30,000 pipes, is also the loudest in the world (due to high wind pressures) in order to fill the massive auditorum with sound. It has been dormant for roughly 70 years. 

Turn up the volume for the quiet first verses of this hymn, then hang on for the last time through. Then consider that only about 30% of the pipes have been restored to use. It will get more impressive, if that is possible.