Amazon.com is a retail behemoth. You know this. You probably just ordered something. As the world's largest online retailer, the company founded by Jeff Bezos back in '94 has built a customer base of over 30 million people. With that many shoppers ordering everything from books to vacuum cleaners, you can imagine how crazy Amazon's fulfillment centers can get. If you can't, digest this: Amazon hired an extra 50,000 workers to help fulfill orders for the holiday season. Still doesn't seem insane? Peep the next 10 photos.