The Macellum of Pozzuoli is an archaeological site located in the municipality of the same name in the metropolitan city of Naples. Due to the dual interest it has, archaeological and scientific, it is one of the best-known monuments of the entire ancient world.
The building has long been improperly called the Temple of Serapis, due to the discovery of a statue of the Egyptian god in 1750, at the time of the first excavations. Subsequent studies have instead ascertained that it is the ancient Macellum, that is, the public market of Roman Puteoli. In terms of size, it is the third most important Neapolitan monument of this type.
On a scientific level, it has represented for some centuries the most precious and precise metric index available to measure the phenomenon of bradyseism.