The general character of the construction is open to but little doubt. The wall was made of bricks, either baked in kilns, or (more probably) dried in the sun, and laid in a cement of bitumen, with occasional layers of reeds between the courses. Externally it was protected by a wide and deep moat. On the summit were low towers, rising above the wall to the height of some ten or fifteen feet, and probably serving as guardrooms for the defenders. These towers are said to have been 250 in number; they were least numerous on the western face of the city, where the wall ran along the marshes. They were probably angular, not round; and instead of extending through the whole thickness of the wall, they were placed along its outer and inner edge, tower facing tower, with a wide space between them--“enough,” Herodotus says, “for a four-horse chariot to turn in.” The wall did not depend on them for its strength, but on its own height and thickness, which were such as to render scaling and mining equally hopeless.
Such was Babylon, according to the descriptions of the ancients--a great city, built on a very regular plan, surrounded by populous suburbs interspersed among fields and gardens, the whole being included within a large square strongly fortified enceinte. When we turn from this picture of the past to contemplate the present condition of the localities, we are at first struck with astonishment at the small traces which remain of so vast and wonderful a metropolis. “The broad walls of Babylon” are “utterly broken” down, and her “high gates burned with fire.” “The golden city hath ceased.” God has “swept it with the bosom of destruction.” “The glory of the kingdoms, the beauty of the Chaldees’ excellency,” is become “as when God overthrew Sodom and Gomorrha.” The traveller who passes through the land is at first inclined to say that there are no ruins, no remains, of the mighty city which once lorded it over the earth. By and by, however, he begins to see that though ruins, in the common acceptation of the term, scarcely exist--though there are no arches, no pillars, but one or two appearances of masonry even yet the whole country is covered with traces of exactly that kind which it was prophesied Babylon should leave. Vast “heaps” or mounds, shapeless and unsightly, are scattered at intervals over the entire region where it is certain that Babylon anciently stood, and between the “heaps” the soil is in many places composed of fragments of pottery and bricks, and deeply impregnated with nitre, infallible indications of its having once been covered with buildings. As the traveller descends southward from Baghdad he finds these indications increase, until, on nearing the Euphrates, a few miles beyond Mohawil, he notes that they have become continuous, and finds himself in a region of mounds, some of which are of enormous size.