IRS 30th Street Campus (a.k.a Philadelphia General Post Office, a.k.a. Philadelphia, Pennsylvania Processing and Distribution Center)
2970 Market Street
While the United States Postal Service is in decline (mainly because of this, the Internet), there was once a time when the Post Office was the most importance service in the country. This building represents that age in the city like no other...in the form of a giant Monolithic Art Deco Riverfront Fortress of Mail Distribution of Doom and Associated Apocalypses.
Read more at Hidden City Philadelphia!!