With a massive number of recalled vehicles and several trips to Capitol Hill, the news out of General Motors hasn't been entirely rosy this year. But the company has been bestowed with one big reason to smile: The GM Warren Tech Center has been chosen by the US Department of the Interior and National Park Service to be a National Historic Landmark. The complex was originally opened on on May 16, 1956 with a ceremony by President Dwight Eisenhower.
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