The Locks at Sault Sainte Marie play a very important role in American commerce. They are used by large vessels carrying ore from the Marquette Iron Range, grain from the Upper Midwest (via Duluth), and coal from the vast mines in Wyoming (also via Duluth). The first canal was opened in 1855, though of course native Americans had been using this site as a place of portage for ages before that. Father Jacques Marquette was here in 1688, and in the town (on the American side) is an interesting museum with several historic sites from the 18th and 19th centuries. But I like just like to come here and watch the ships go by.
(I wonder why the VT editors have the Canadian city listed as "Sault Sainte Marie Ontario" while the town on the American side is "Sault Ste. Marie Michigan"?)