On passing through the Propylaea all the glories of the Acropolis became visible. The chief building was the Parthenon (I.E. House of the Virgin), the most perfect production of Grecian architecture. It derived its name from its being the temple of Athena Parthenos, or Athena the Virgin, the invincible goddess of war. It was also called HECATOMPEDON, from its breadth of 100 feet. It was built under the administration of Pericles, and was completed in B.C. 438. The Parthenon stood on the highest part of the Acropolis near its centre, and probably occupied the site of an earlier temple destroyed by the Persians. It was entirely of Pentelic marble, on a rustic basement of ordinary limestone, and its architecture, which was of the Doric order, was of the purest kind. Its dimensions were about 228 feet in length, 101 feet in breadth, and 66 feet in height to the top of the pediment. It consisted of a cella, surrounded by a peristyle. The cella was divided into two chambers of unequal size, the eastern one of which was about 98 feet long, and the western one about 43 feet. The ceiling of both these chambers was supported by rows of columns. The whole building was adorned with the most exquisite sculptures, executed by various artists under the direction of Phidias. These consisted of, 1. The sculptures in the tympana of the pediments (I.E. the inner portion of the triangular gable ends of the roof above the two porticoes), each of which was filled with about 24 colossal figures. The group in the eastern or principal front represented the birth of Athena from the head of Zeus, and the western the contest between Athena and Poseidon (Neptune) for the land of Attica. 2. The metopes between the triglyphs in the frieze of the entablature (I.E. the upper of the two portions into which the space between the columns and the roof is divided) were filled with sculptures in high relief, representing a variety of subjects relating to Athena herself, or to the indigenous heroes of Attica. Each tablet was 4 feet 3 inches square. Those on the south side related to the battle of the Athenians with the Centaurs. One of the metopes is figured below. 3. The frieze which ran along outside the wall of the cella, and within the external columns which surround the building, at the same height and parallel with the metopes, was sculptured with a representation of the Panathenaic festival in very low relief. This frieze was 3 feet 4 inches in height, and 520 feet in length. A small portion of the frieze is also figured below. A large number of the slabs of the frieze, together with sixteen metopes from the south side, and several of the statues of the pediments, were brought to England by Lord Elgin, of whom they were purchased by the nation and deposited in the British Museum.