View of Fort Mackinac on hill at Mackinac Island. Park with statue on pedestal in foreground. Printed on front: "The old fort, Mackinac Island, Mich., 13011. Fort Mackinac built in 1780 is situated 133 feet above the water and commands the town, harbor and straits. Copr. Detroit Publishing Co." Printed on back: "Phostint made only by Detroit Publishing Co." Handwritten on back: "Sweet Marie, Having heard of your serious illness due to lack of sleep and food, I hasten to extend my deepest sympathy. Lovingly ... " Card is postmarked August 6, 1917.