The Roman antiquities, t. 4, Plate XXV. Bridge cross-section of Cestius. 

This etching, "The Roman Antiquities, t. 4, Plate XXV. Bridge cross-section of Cestius," is a technical drawing by the Italian artist Giovanni Battista Piranesi. The image is a cross-section of the bridge of Cestius in Rome, showing its internal structure in detail. Piranesi was a master of the etching technique, and he used it to create intricately detailed and realistic representations of Roman architecture. His work is considered a cornerstone of the architectural printmaking of the 18th century.