The Promenade Deck and the Terrazza Umberto I, the latter built on the old bastion of Sperone, were designed in 1896 by engineer Giuseppe Costa and Fulgenzio Setti. The entire building is done in classical style, with Corinthian columns, and was built of white limestone and yellow. It was inaugurated in 1901. The double staircase, with which you enter from Piazza Costituzione, the Promenade Deck stops, and ends under the Arc de Triomphe, in the Terrace Umberto I. In 1943, the staircase and the Arch of Triumph were badly damaged by bombs in the Second World War, but was faithfully rebuilt after the war.