Miniatur Wunderland in Hamburg is, according to the Guinness Book of Records, the world's largest model train set. It's so large—including airports, cityscapes and even seas—that to even call it a train set seems a good example of the German sense of humor. It covers 1,500 square meters, has 260,000 figurines in it , 9,250 cars, 1,040 trains, 42 planes, 385,000 LEDs, and cost 21 million Euros to construct.
