This might be a view of the sixteenth-century castle of Baia, which was situated beside the sea between Baia and Bacoli. However, it is more likely to depict the castellated buildings in Pozzuoli itself, several of which can be seen in the panoramic view of the bay in the introduction to Paoli's Avanzi Delle Antichita Esistenti a Pozzuoli Cuma e Baja, Naples, 1768, pl. IV. The domestic building on the left of the drawing is likely to be part of the town and is similar to that depicted in Adam vol.57/2.
If the drawings were arranged in the order of Adam's travels, then views of the town and the Grotto di Napoli (Adam vol.57/6) should appear at this stage, with those around Capua appearing at the end of this section. However, if these drawings are depicting sites around the Lago Fucino and the Liri river, which Robert Adam saw on his return journey to Rome, they should appear later with Adam vol.57/34.