When they build those big huge skyscrapers, you always see one or more of those huge cranes on the top of them during the building process. As the building goes up from 10 to 20 to 40, 50 or 60 floors, they keep moving the cranes so they are always on the very top. When they finally finish, how to they get the last crane down? I would image that for buildings that use 2 or 3 cranes, they use one of the cranes to lower the disassembled pieces of the other cranes, but what about the last crane? How do they get it down?
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