The central wing, the largest one, has the shape of a Doric six-Column temple. A wall, with five gates, divides the building into two halls. The outer, western hall is the larger one. This is the Propylaea proper. This hall includes six interior columns of ionic order. As a consequence, the propylaea combines, like other buildings of the Acropolis, the Doric with Ionic order. So aesthetically speaking, there is a balance between the two orders. At the same time the Acropolis assumes a Panhellenic character, since the two orders come from different areas of the Hellenic world, which correspond to different Hellenic tribes.
The north wing of the propylaea is called today the "Pinacotheke"(Gallery) because, as Pausanias informs us, they used to display paintings there during the Roman Period.
At the propylaea there were many votive offerings. You can see them, in front of the Gallery, the pedestal of the monument of Agrippa, dedicated in memory of Agrippa, son-in-law of the Roman Emperor Augustus, who built the Odeum with the same name at the Agora in the 1st century BC.