NASA Space Shuttles
NASA's official night launches might be over, but you can recreate them with one of the remaining NASA Space Shuttles (roughly $28 million). Space Shuttle Discovery has already been sold, but Atlantis and Endeavour are both still available, representing not only a verified piece of human history but billions of dollars worth of government funded R&D. Plus, you know, it's actually been to space, not unlike a gigantic moon rock that you'll need more than just a little shelf space to display. [Thanks, Andrew]