On examining the interior of one of these spires, it is a subject of surprise that they could have been so constructed as to be durable. Instead of walls, you are surrounded by a succession of little balustrades, one over the other, converging towards the summit. The space enclosed is exposed to all the winds, and the thickness of the stones so slight as to have required their being bound together with iron cramps. At a distance of a mile these spires appear as transparent as nets. On entering the church by the western doors, the view is interrupted, as is usual in Spain, by a screen, which, crossing the principal nave at the third or fourth pillar, forms the western limit of the choir; the eastern boundary being the west side of the transept, where there is an iron railing. The space between the opposite side of the transept and the apse is the _capilla mayor_ (chief chapel), in which is placed the high altar. There are two lower lateral naves, from east to west, and beyond them a series of chapels. The transept has no lateral naves. Some of the chapels are richly ornamented. The first or westernmost, on the north side, in particular, would be in itself a magnificent church. It is called the "Chapel of Santa Tecla." Its dimensions are ninety-six feet in length, by sixty-three in width, and sixty high. The ceiling, and different altars, are covered with a dazzling profusion of gilded sculpture. The ceiling, in particular, is entirely hidden beneath the innumerable figures and ornaments of every sort of form, although of questionable taste, which the ravings of the extravagant style, called in Spain "Churriguesco" (after the architect who brought it into fashion), could invent.