In the weeks leading up to Christmas, most of us start to notice the arrival of Christmas packages at our doorsteps. But did you ever stop to think how, exactly, they got there? Sure, you’ve probably gotten pretty friendly with your UPS delivery guy by now. However, his arrival at your doorstep is just one small part of the equation. In truth, the success of your deliveries mostly hinges on a place called Worldport, a gigantic UPS sorting facility in Louisville, Kentucky. It might seem like factory business as usual, but with 36 million packages delivered just this past Tuesday alone (its their busiest day of the year), Worldport must operate seamlessly and without interruption. See the entire process in action below.