The valley, wide and fruitful, supplied its inhabitants with the necessaries of life, and all delights and superfluities were added at the annual visit which the emperor paid his children, when the iron gate was opened to the sound of music; and during eight days every one that resided in the valley was required to propose whatever might contribute to make seclusion pleasant, to fill up the vacancies of attention, and lessen the tediousness of time. Every desire was immediately granted. All the artificers of pleasure were called to gladden the festivity; the musicians exerted the power of harmony, and the dancers showed their activity before the princes, in hope that they should pass their lives in this blissful captivity, to which those only were admitted whose performance was thought able to add novelty to luxury. Such was the appearance of security and delight which this retirement afforded, that they to whom it was new always desired that it might be perpetual; and as those on whom the iron gate had once closed were never suffered to return, the effect of long experience could not be known. Thus every year produced new schemes of delight and new competitors for imprisonment. The palace stood on an eminence raised about thirty paces above the surface of the lake. It was divided into many squares or courts, built with greater or less magnificence, according to the rank of those for whom they were designed. The roofs were turned into arches of massy stone, joined by a cement that grew harder by time, and the building stood from century to century deriding the rains and equinoctial hurricanes, without need of reparation. This house, which was so large as to be fully known to none but some ancient officers who successively inherited the secrets of the place, was built as if suspicion herself had dictated the plan. To every room there was an open and secret passage; every square had a communication with the rest, either from the upper stories by private galleries, or by subterranean passages from the lower apartments. Many of the columns had unsuspected cavities, in which a long race of monarchs had deposited their treasures. They then closed up the opening with marble, which was never to be removed but in the utmost exigencies of the kingdom; and recorded their accumulations in a book which was itself concealed in a tower not entered but by the emperor, attended by the prince who stood next in succession.