Plans, at left, of the Ara Pacis and at right, of the Archaic altar of Apollo at Didyma, for comparison with the plan of the Sanctuary of the Twelve Gods.
Small poros altar still <i>in situ</i> on the West Slope of the Acropolis by the Beule Gate. Closely similar in material and workmanship, it may give an idea of the scheme of the Agora altar.