From the beginning, Olympic games have left behind physical traces, whether in the form of the ruins at Olympia in Greece or, in modern times, in host cities dotting the world. Stadiums, stands and podiums often stay in place long after the last competitor has left the locker room.
Mark McDonald recently reported on the unused and dilapidated Chinese venues, which, just four years ago, during the 2008 Beijing summer games, seemed so shinny. Embarrassingly, the organizers of the Montreal summer games in 1976 didn't finish construction on some of the venues until well after the athletic competitions were over.
The ultimate sustainable architectural mark of the Games may be not leaving a mark at all.