The Porta Tiburtina, Rome, carrying the aqueduct of the Aqua Julia, Aqua Marcia and Aqua Tepula. Etching by G.B. Piranesi, 1761.

Three inscriptions above the arch record stages in the history of the structure. Left, houses, one of which has on the left side of its front door the monogram of the name of Jesus (IHS) and on the right side the cross with instruments of the Passion. Gesticulating people are shown