Propylaea: Transverse Section looking East. Plate 29, Chapter X. By Francis Penrose, 1888.

An investigation of the principles of Athenian architecture: or the results of a recent survey conducted chiefly with reference to the optical refinements exhibited in the construction of the ancient buildings at Athens.
Francis Penrose, 1888

Source: https://digi.ub.uni-heidelberg.de/diglit/penrose1888
Images in the public domain

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Acropolis Architecture Athens Classical Propylaea Reconstructions and Plans