I was thinking about you plumbing and mechanical folks the whole time, because I saw things that you would've loved. How about 800 miles of 48-inch diameter, 1/2-inch-thick pipe - that's 19,000 truckloads - with 108,000 welds holding it together! It's the Alaska Pipeline. More than half of it is above ground; that means you can see it, touch it, and feel the heat.