The aggregate of the Takht-e-Soleiman monument is placed on a natural high land, about 20 m. above the surrounding plain. All the structural relics have been constructed within an oval shaped rampart. The exterior rampart with 5 m. thickness, 14 m. height and outer circumference of 1,200 m. has 38 conical defense towers.
The outer wall is a remnant from the Sassanian period. During the Ilkhanan reign, a new gateway had been constructed adjoined with the former southern gateway. Within the oval rampart there are two square plots, with uniaxis and different centers.