It's a great American tradition. When something is old and less useful than it once was, we just tear it down to make room for new and more useful things. That's exactly what's happened to the Mate-Demate Device (MDD) at NASA's Kennedy Space Center. It used to mount Space Shuttles on 747s. Now it's scrap metal.
With huge chains and honking cranes, that's how. Example: This Republic of Korea Navy's corvette—half of it, actually—floating over the sea's surface. And before you cry "PHOTOSHOP!", check out the scene from a distance.