For an aviation enthusiast, no trip to D.C. would be complete without a visit to the Smithsonian's National Air & Space Museum. It is stunning to see what they have gathered together. In this one view alone, you can see Lindberg's Spirit of St. Louis, Yeager's Glamorous Glennis (which first broke the sound barrier), and Space Ship One. I bet they double-checked the wires suspending those babies. More on the rest of the incredible collection in another essay.