"Seattle, Washington. The new King County Domed Stadium (home of the Seahawks) opens in 1976 and is the dominating structure in this birds eye view of the 'Queen City.' The stadium covers 9.1 acres -- 720 feet outside diameter -- 250 feet to top of dome -- will seat 60,000 for baseball, 65,000 for football and 80,000 for personality shows."
As it turned out, this structure became the King County Doomed Stadium.