Karim Khan Citadel has 4 walls of 12-meter height that are attached to 4 circular brick towers of 14-meter height with a 90-degree angle. The dominant material used in this structure is stone and stucco. It is constructed in a way that can have both residential and political functions. Strong and high external walls with parapets above them built for the soldiers and with the purpose of shooting. The Citadel has a defective trapeze plan and this is due to the fact that the soil on the northwestern part was not appropriate for building such a huge tower. So, the architects changed the former plan in order to keep the tower safe. The towers around Karim Khan Citadel have three separate floors that one can get to the upper floor using the spiral staircase. There are two rooms on each floor, one of which was for the soldiers to relax and rest, and the other one for keeping weapons. The residential buildings of the citadel are located in the northern, western, and southern part. They each have one veranda or two stone columns on their front facade. The rooms of these buildings are decorated with Iranian artistic architecture like muarnas and the like. One interesting point about these rooms is that they are all interconnected. In front of each veranda, a small pond is designed which used to be fed by Rokn Abad Qanat that it is now dried out. The gate of the eastern tower which is the main gate of the citadel is decorated with a big tiling tableau. This tableau is an image of the well-known Persian myth, Shahnameh. The private bath of the king and some other welfare amenities are also there.