Aula Ottagona

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