To make it onto the list that now includes 2,554 sites nationwide, a place has to show, "exceptional value and quality in illustrating or interpreting the heritage of the United States," and the GM Tech Center certainly fits that bill as one of the places shaping the company's vehicles for decades. According to the National Park Service, the campus is receiving the honor because it "is one of the most significant works of architect Eero Saarinen, who was among the most important modernist designers of the post-World War II period in the United States."
Unfortunately, the Tech Center hasn't had the strongest year either. It recently suffered about $75 million in damage earlier this year because of flood damage, according to The Detroit News. The strong rains in the area reportedly left six to seven feet of water in some of the basements. That would have been bad enough, but it also destroyed some significant pieces of GM history.