Get an Inside Look at Amazon's Massive Fulfillment Centers

Employees collect merchandise ordered by customers for shipment from the Amazon.com distribution center in Phoenix, Arizona, Nov. 26, 2012.

A worker collects order items at the Fulfilment Centre for online retail giant Amazon in Peterborough, central England, on Nov. 28, 2013.

Merchandise sits on shelves before shipment at the Amazon.com Inc. distribution center in Phoenix, Arizona, Nov. 26, 2012.

An employee packs merchandise for shipment at the Amazon.com Inc. fulfillment center in Phoenix, Arizona, Dec. 2, 2013.

A picture shows the Fulfilment Centre for online retail giant Amazon in Peterborough, central England, on November 28, 2013, ahead of Cyber Monday on December 2nd, expected to be one of the busiest online shopping days of the year.

An employee packs orders in the Fulfilment Centre for online retail giant Amazon in Peterborough, central England, on November 28, 2013, ahead of Cyber Monday on December 2nd, expected to be one of the busiest online shopping days of the year.

Employee Maria Miller loads boxes onto a conveyer belt for shipping at the Amazon.com Inc. distribution center in Phoenix, Arizona, U.S. on Monday, Nov. 26, 2012.

Interior view of the hall of a logistics center of the online shopping company Amazon, taken on March 26, 2014 in Leipzig, eastern Germany.

Packages sit in regional delivery dividers ahead of distribution at the Amazon.co.uk Marston Gate 'Fulfillment Center,' the U.K. site of Amazon.com Inc. in Ridgmont, United Kingdom, Dec. 3, 2012.