DULUTH
| Date | Clue |
|---|---|
| 2018-05-16 | Port at the west end of Lake Superior |
| 2012-12-24 | Minnesota city that shares a harbor with Superior, Wis. |
| 2010-08-10 | Lake Superior port |
| 2005-03-28 | Minnesota port |
| 2004-06-21 | University of Minnesota campus site |
| 1997-11-09 | St. Lawrence Seaway terminus |