Mackinac Bridge's vintage steel grating sections, part of the longest suspension bridge, are up for auction until March 17, 2024, as a unique Mother's Day gift suggestion.

Mackinac Bridge's vintage steel grating, part of the longest suspension bridge in the Western Hemisphere, is up for auction. The Michigan Department of Transportation suggests it as a unique Mother's Day gift. Five 2-ton sections, each 5.5 ft x 38.5 ft, are available for bidding through March 17, 2024, with some pieces already over $600. Buyers must sign a "Hold Harmless agreement."