Some of the worlds biggest construction projects are related to energy and transportation. Here is a relatively small section of a refinery, the residual coking tanks. After nearly 50-years of use, they need to be replaced - in a plant where replacement was never planned. Answer, bring new tanks from Spain, close LA to move the tanks from port to refinery, get a big-ass Crane to lift the superstructure away from the old tanks and drop in the new tanks. Easy, but expensive.