The ancient architects, studying utility more than effect, preferred spreading out their buildings to piling them up, and rarely, unless in thickly-peopled towns, even introduced a second story.
The spectator, however, was impressed with a sense of grandeur in another way.

The use of huge blocks of stone, not only in platforms, but in the buildings themselves, in the shafts of pillars, the antae of porticos, the jambs of doorways, occasionally in roofs, and perhaps in epistylia, produced the same impression of power, and the same feeling of personal insignificance in the beholder, which is commonly effected by great size in the edifice, and particularly by height.

The mechanical skill required to transport and raise into place the largest of these blocks must have been very considerable, and their employment causes not merely a blind admiration of those who so built on the part of ignorant persons, but a profound respect for them on the part of those who are by their studies and tastes best qualified for pronouncing on the relative and absolute merits of architectural masterpieces.
Among the less pleasing peculiarities of the Persian architecture may be mentioned a general narrowness of doors in proportion to their height, a want of passages, a thickness of walls, which is architecturally clumsy, but which would have had certain advantages in such a climate, an inclination to place the doors of rooms near one corner, an allowance of two entrances into a great hall from under a single portico, a peculiar position of propylaea, and the very large employment of pillars in the interior of buildings.

In many of these points, and also in the architectural use which was made of sculpture, the style of building resembled, to some extent, that of Assyria; the propylaea, however, were less Assyrian than Egyptian; while in the main and best features of the architecture, it was (so far as we can tell) original.

The solid and handsome stone platforms, the noble staircases, and the profusion of light and elegant stone columns, which formed the true glory of the architecture--being the features on which its effect chiefly depended--have nowhere been discovered in Assyria; and all the evidence is against their existence.