Apparently, they had lots of time on their hands: Historians recently discovered more than 50 drawings, initials, dates and more carved into a wooden door from the castle’s tower—including one ...

See, the drawing was of Sforza Castle ... He turned it into the Sforza Castle, complete with towers, courtyards, and frescoed-lined halls. In 1494, Francesco’s successor, Ludovico Sforza ...