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Everyone who visits Chicago inevitably sees the skyline, with the Willis Tower on the south end and the John Hancock Tower on the north end.  The Trump Tower is in the middle, as is the Amoco Building (now the Aon Center) .  What many don't see is the spiral drum immediately to the east of the Hancock Tower.  It is part of the ramp that leads to the parking garage on the lower floors of the Hancock.  It is made of concrete, and looks similar in shape to the Guggenheim Museum in New York City, although on further reflection, there are big differences.