Roman terrace - styled plaza originally designed by the architects Olmsted Brothers in 1914 -- 1916 , built as the grand entrance for the 1926 Sesquicentennial Exposition .
Roman terrace - styled renamed to honor Marconi .
Roman terrace - styled plaza originally designed by the architects Olmsted Brothers in 1914 -- 1916 , built as the grand entrance for the 1926 Sesquicentennial Exposition and renamed to honor Marconi .