Seven Major League Baseball teams have stadiums with retractable or moveable roofs. One of them is right here in Wisconsin. American Family Field, formerly Miller Park, opened in 2001. The ballpark’s most distinctive feature is its moveable roof, which is made up of 12,000 tons of steel. The fan-shaped roof has seven panels, five of which are movable. The roof, which is 200 feet above the field, “spans approximately 600 feet from home plate to the outfield track beam,” according to the Brewers w