Plans for the domed stadium were proposed in 1963. In April 1965 the Astrodome opened, under the name of the Harris County Domed Stadium. Cardinals owner Bill Bidwill about sharing a proposed 70,000 seat domed stadium in Phoenix. Canada's first domed stadium, BC Place Stadium opened in 1983. The Judge called the new domed stadium the Astrodome. Round Valley is the only high school in the world to have a domed stadium. AT&T Stadium is the largest domed stadium in the world. The Silverdome became the seventh domed stadium to host tournament games. The Georgia Dome was a domed stadium in the Southeastern United States. The RCA Dome (originally Hoosier Dome) was a domed stadium in Indianapolis. A domed stadium was thought to be a must due to Seattle's frequent rain. Allegiant Stadium is a domed stadium under construction, located in Paradise, Nevada, United States.