Colossal head of Constantius II or Constans

The two porticoes on opposite sides and the large open-air space contain important examples of Roman sculpture. 
On the left we can see remains of the cell decoration from the Temple of the God Hadrian, with reliefs portraying the Provinces of the Roman empire and military trophies. 
Along the righthand wall of the courtyard, containing the embedded remains of three archways belonging to the palazzo's original XV century structure, is a row of fragments from a colossal statue of Constantine from the Basilica of Maxentium.