This artifact needs little explanation, but just in case you were wondering. The walls of Rome, also known as the Aurelian Walls are a line of city walls built between 271 AD and 275 AD during the reign of Emperor Aurelian and Probus. These walls enclosed all of the Seven Hills of Rome, the Aventine, Caelian, Capitoline, Esquiline, Palatine, Quirinal, and the Viminal, plus the Campus Martius and, on the right side of the Tiber River, the Trastevere district. The full length of the Aurelian Walls ran for 12 miles surrounding and area of 5.3 square miles. The walls were constructed in brick-faced concrete, were 11 feet thick and 26 feet high, with a square tower every 100 “Roman feet”, which is approximately 97 feet. In the 4th century, remodeling doubled the height of the walls and the circuit possessed 383 towers, 7,020 crenellations, 18 main gates, 5 postern gates, 116 latrines, and 2,066 large external windows. The entire size of the walls enclosed and area of approximately 3,500 acres. The walls of Rome ultimately aided Rome because of its military defenses and created a political boundary, no armies were allowed to pass inside the walls of Rome, which helped Rome continue to be a great empire.