Unnecessary pinnacles and turrets were prohibited.
In length by 4 in width, it consists of a series of precipitous rocks rudely piled into irregular blocks and pinnacles, and strongly contrasting with a rich vegetation.
The most magnificent part of the exterior and indeed the finest polychrome monument in existence is the west façade, built of richlysculptured marble from the designs of Lorenzo Maitani of Siena, and divided into three gables with intervening pinnacles, closely resembling the front of Siena cathedral, of which it is a reproduction, with some improvements.
The surface is often remarkably honeycombed, and the rock weathers into pinnacles, pillars and arches of extraordinary shapes.
The cuneiform inscriptions are on the rock pinnacles above the town, with some rock chambers, indicating a town or fortress of the Vannic period.