The Roman antiquities, t. 4, Plate V. Plan of the Mausoleum of Hadrian and Bridge St. Angel. 

This etching by Italian artist Giovanni Battista Piranesi depicts the Mausoleum of Hadrian (now known as Castel Sant'Angelo) and the adjacent bridge, Ponte Sant'Angelo. The detailed perspective drawing of the bridge showcases the bridge's multiple arches and foundation structure. Piranesi's meticulous attention to detail and interest in Roman antiquity are evident in this work, which is one of his famous engravings from the series, "Roman Antiquities."