The wall runs dead straight up the steep gradient to the circular tower.

Aristotle wrote that city walls were not only essential for defence, but that the aesthetic aspect of their construction should be taken into consideration, so that "they may be a proper ornament to the city":

"With respect to walls, those who say that a courageous people ought not to have any, pay too much respect to obsolete notions; particularly as we may see those who pride themselves therein continually confuted by facts.

It is indeed disreputable for those who are equal, or nearly so, to the enemy, to endeavour to take refuge within their walls. But since it very often happens, that those who make the attack are too powerful for the bravery and courage of those few who oppose them to resist, if you would not suffer the calamities of war and the insolence of the enemy, it must be thought the part of a good soldier to seek for safety under the shelter and protection of walls, more especially since so many missile weapons and machines have been most ingeniously invented to besiege cities.

Indeed to neglect surrounding a city with a wall would be similar to choosing a country which is easy of access to an enemy, or levelling the eminences of it; or as if an individual should not have a wall to his house lest it should be thought that the owner of it was a coward.

Nor should this be left unconsidered, that those who have a city surrounded with walls may act both ways, either as if it had or as if it had not; but where it has not they cannot do this. If this is true, it is not only necessary to have walls, but care must be taken that they may be a proper ornament to the city, as well as a defence in time of war; not only according to the old methods, but the modern improvements also. For as those who make offensive war endeavour by every way possible to gain advantages over their adversaries, so should those who are upon the defensive employ all the means already known, and such new ones as philosophy can invent, to defend themselves: for those who are well prepared are seldom first attacked."

Aristotle, Politics (Πολιτικά, Things concerning the polis), Book 7, chapter 11.