The interior, decorative dome in the Minnesota State Capitol Rotunda in Saint Paul is sixty feet in diameter. It is just one of the beautiful elements designed by Cass Gilbert, a young Saint Paul architect. Based on this early success, he went on to design other state capitols and the U.S. Supreme Court. He also became a pioneer in building skyscrapers such as the Woolworth Building. That NYC landmark was the world’s tallest in 1913.