Protection from invasion and enemies. The walls are high and usually have watchtowers to look for armed forces approaching the city so a warning can be given and gates closed.
Most city states were surrounded by walls for protection purposes.
Mt Taygetus and Mt Parnon surrounded the valley in which the Spartans occupied. :)
defend the enemy.like the castle
If you mean cities/towns, there were Ostia, Laurentum, Veii, Eretum, Portus Lavinium and Reate. There was the Servian wall too that surrounded the city.
No. Nehemiah's wall was a fortification structure that surrounded the Old City of Jerusalem and has since been completely destroyed. The Western Wall is a retaining wall within the city to make the Great Temple esplanade level.
The wall of the pulp cavity is surrounded by Dentin
cell wall
The Forbidden City is 74 hectares, and is surrounded by a 6 metre deep moat, and a 10 metre high wall.
They Built a wall around thier city-state
There is no actual wall surrounding the Vatican. In some areas, such as the Papal Gardens, there is a wall but in many areas the only thing that separates the Vatican from the city of Rome is a white line painted on the street or walkway.
No, bacteria is surrounded by a cell wall.
It is the remnants of the wall that surrounded the Second Temple.