The movie Somewhere in Time , which was filmed on Mackinac Island, opened in theaters nationwide on this day, October 3, 1980.
The movie was filmed on location at the Grand Hotel, as well as the Mission Point Fine Arts building of the former Mackinac College (now Mission Point Resort), both located on Mackinac Island, Michigan. Additional scenes were filmed in Chicago, Illinois.
For more information about the film, see Somewhere in Time wikipedia entry
Source : Michigan History, September/October 2020.