An only partially excavated and, except for its façade along the street greatly ruined, building housed the training grounds. Of the later some detailed pictures are shown, others are from “inside” or from some distance. The structure was dedicated to the Emperor Claudius by Julius Cornutus, Magna Plancia's husband. It was erected from travertine on a square plan, with the sides 76 meters long. The palaestra was a place for physical exercises and consisted of an open courtyard surrounded by changing rooms. Running water was supplied by an aqueduct.