After looking about the esplanade and exploring the dim recesses of the gloomy ammunition-vaults, I climbed a crooked flight of disintegrating stone steps and entered, between two massive quadrangular bastions,[6] the lower story--if I may so call it--of the castle proper. As seen from the ocean outside of the harbor, this ancient fortress appears to consist of three huge cubes of gray masonry, superimposed one upon another in such a manner as to present in profile the outline of three rocky terraces; but whether this profile view gives anything like a correct idea of the real shape of the building I am unable to say. From the time when I entered the gateway at the head of the flight of stone steps that led up from the esplanade, I was lost in a jumbled aggregation of intercommunicating corridors, bastions, grated cells, stairways, small interior courtyards, and huge, gloomy chambers, which I could not mentally group or combine so as to reduce them to intelligible order or bring them into anything like architectural harmony. The almost complete absence of windows made it impossible to orient one's self by glancing occasionally at some object of known position outside; the frequent turns in the passages and changes of level in the floors were very confusing; the small courtyards which admitted light to the interior afforded no outlook, and I simply roamed from bastion to bastion and from corridor to corridor, without knowing where I was, or what relation the place in which I stood bore to the castle as a whole. Now and then I would ascend a flight of stone steps at the side of a courtyard and come out unexpectedly upon what seemed to be a flat roof, from which I could see the entrance to the harbor and the white walls of the Estrella battery hundreds of feet below; but as soon as I went back into the maze of passages, chambers, and bastions on that level, I lost all sense of direction, and five minutes later I could not tell whether I was on the northern side of the castle or the southern side, nor whether I was in the second of the three cubes of masonry or the third.