Aula Ottagona

The austere Aula Ottagona (Octagonal Hall) was once part of the Diocletian baths complex. In the 1920s its huge cupola was used as a planetarium, but today the vaulted space is part of the Museo Nazionale Romano. It houses the Museo delle Arti Salvate (Museum of Salvaged Art), which displays illegally traded art and artifacts recovered in police busts before they are returned to their rightful locations.