When the Long Walls of Athens were completed there was no longer any need of fortifications to the Acropolis, though the architectural conception of the whole mass remained that of a shrine and citadel combined. The prehistoric Pelasgians had levelled the top, fortified it on the west, its only accessible end, and surrounded it with a wall. The whole plateau rises to a height of 200 feet. Approaching it from the agora to the west, the pilgrim passes up a flight of low steps to the porch, or propylæa. This was completed in 432 by Mnesicles on the site of an older and much humbler gateway of Kimon’s day. Modern investigators have shown that it was planned on a far more extensive scale than the actual execution, and that room was left for subsequent completion. It is believed that the outbreak of the Peloponnesian War was the cause of this limitation of the original scheme. Even so it was celebrated in antiquity, and is far the most impressive building erected by the Greeks for secular purposes. It consists of a gateway formed by a wall with five openings and fronted by a Doric colonnade, with gable roof and pediment, flanked on each side in the original plan by two colonnaded halls, a smaller one in front and a larger behind. This plan is clearly a development of the gateways of prehistoric citadels like Tiryns and Troy II. One of the wing chambers was used as a picture gallery, the walls being frescoed by Polygnotus and other celebrated painters. This hall is still in excellent preservation, due to its use by the Franks as a council chamber and by the Turks as the palace of their pashas. Some of the stone beams are as long as 20 feet. The front chamber of each wing rested on an artificial stone bastion, and as that on the south was never completed the platform remained free for the erection of a lovely miniature shrine, the temple of the Wingless Victory.[64] This, though its stones were totally scattered and built into a Turkish bastion, was reconstructed in 1835 by European architects with such success that it is one of the most charming things in Athens. It must have been built soon after the abandonment of the original plan for the propylæa. It has four columns of the Ionic order at each end, surmounted with a sculptured frieze, of which four panels are in the Elgin collection. The whole shrine, which is only 18 feet by 27 feet, was surrounded by a railing supported on a marble balustrade carved with Victories in low relief. Though they are mostly headless, [Illustration: PLATE XLVIII. THE PARTHENON. MODERN VIEW FROM NORTH-WEST _English Photo Co., Athens_]