LEONARDO DA VINCI (April 15; 1452 - May 2; 1519) exhibited to the leader Cesare Borgia; Duke of Valentino (September 13; 1475 - March 12; 1507) the plans for the fortifications of the castles in Romagna. Detail from the base of the monument to Leonardo; high relief that illustrates the genius of architect and strategist. Commemorative sculptural group created by the sculptor Pietro Magni (21 October 1816 - 9 January 1877); inaugurated on 4 September 1872 in Piazza della Scala in Milan. Photography by Elena Piccini; Italy; 2019