Flughafen Tempelhof, Berlin, Germany, 2007

This technically bad, blurred, photo was shot from a train, as this was about the only chance I got to see Tempelhof, and I didn't want to pass it up. As Wikipedia says, "Designated by the ministry of transportation on October 8, 1923, Tempelhof is the world's oldest commercial airport, and the world's first airport being connected to a subway-network in 1927." That's something very impressive to me, especially when you consider that it was also the first with restaurants and shops like modern airports, all 25 years before the first jet airliners. It has long enough runways to take 747 jumbo jets, but aircraft visiting Tempelhof are often expected to taxi under certain overhead bridges in the airport that were constructed long before aircraft got so large, so today most planes using Tempelhof are very small by the standards of modern airliners, and there has been talk of closing the airport. I hope myself that it will survive as a museum, and I would support any such effort to preserve it.