It is at present a large square building, uniform and neat all over; but that which is most eminently beautiful in it is its Church. It consists of three Isles, and has in the middle a handsome Cupola, under which is a pavement of Mosaick, equal to, if not exceeding the finest works of the Ancients in that kind. At the upper end of the North Isle, you go down seven Marble steps, to a very splendid Altar, erected over the very place where they say the holy Baptist was Born.