The Port of Rotterdam in the Netherlands is the largest port in Europe, and one of the largest and most important in the world. It is virtually impossible to grasp its scale, but this video gives you a sense of what goes on there.
I will never cease to be amazed by the movements, vehicles, and locations of international shipping.
gCaptain points out that this video is currently broadcasting on a gigantic screen in Rotterdam Central. If you're around, check it out.