All that now remains of the Confessor's buildings, however, are one large gloomy arch in the southern transept, the substructure of the dormitory, a few traces about the choir, and, above all, the famous Pyx House or Chapel of the Pyx, a low narrow room on the south of the abbey, with a vaulted roof, divided down the centre by a row of seven plain pillars with single capitals, once the Treasury of England, in which the regalia of the Scottish kings, including the Holy Cross of Holyrood, were kept. The Pyx House can only be visited by special permission.