Propylaia Panoramic View Acropolis

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Acropolis in Athens

The Propylaea was constructed of white Pentelic marble and gray Eleusinian marble or limestone, which was used only for accents. Structural iron was also used, though William Bell Dinsmoor — "Structural Iron in Greek Architecture," American Journal of Archaeology, XXVI, 1922 — analyzed the structure and concluded that the iron weakened the building.