Above this terrace two flights of stairs conducted to the next principal esplanade, which was of the same length as the first, but narrower. At the back of this esplanade, against the side of the hill, stood two magnificent halls, with an open area between them. The eastern hall is now entirely destroyed, but that on the western side, now serving as the kitchen of the modern seminario, is partly preserved. The front, which may be seen near the cathedral in the Piazza Tonda, was decorated with four Corinthian half-columns, the capitals of which still remain in their original position. The interior had seven recesses on each side, separated by half-columns and pilasters, and probably intended for statues. In front of the side recesses ran a low wall or podium, ornamented with triglyphs like a Doric frieze. These decorations are executed in a style which Nibby considers equal to that of any of the ancient Doric buildings now extant. At the end of the hall there was a large rectangular recess, with niches for statues. In the easternmost of these recesses was found the celebrated Prænestine mosaic, now in the Barberini Palace at Palestrina. The rest of the floor was composed of white mosaic work. Between the fronts of the two halls ran a row of columns, three of which still stand in their original positions in the wall of one of the chapels near the cathedral, and at the back of the area between them was a corridor with nine windows, some of which may still be seen in the court of the seminario. [Sidenote: Central terrace.] Above the terrace of the halls rose the central grand terrace, supported by a great wall of polygonal masonry, which at the point called the Rifolta still stands at its full height. This terrace is now occupied by the Contrada del Borgo. On the eastern side it reached to the wall of the city, where the ancient gate, now closed, near the Porta Portella, stands. Two lofty arches stood, one at each end of the back of this terrace, containing fountains and statues. It was upon this level, according to Nibby, that the original temple stood, before the alterations made by Sylla. [Sidenote: Terrace of Recesses.]