Each day the United States Postal Service processes hundreds of millions of pieces of mail and delivers to over 150 million addresses. At the center of this bustling postal network are more than a hundred Processing and Distribution Centers spread across the United States. Follow these letters, catalogs, magazines, and parcels as they make their way through the Postal delivery network.
See the giant screen exhibit in person at the National Postal Museum in Washington DC! Visit the entire Smithsonian online exhibit: http://npm.si.edu/systemsatwork