Hadrian's Wall

The Seven Kingdoms are divided from the Free Folk and White Walker wildlands by a structure called The Wall, which is located in the extreme north of Westeros. The ice Wall, which stretches from the Shivering Sea in the east to the Bay of Ice in the west, is more than 700 feet tall and more than 100 leagues broad. The White Walkers and the Wildlings who resided beyond the Wall were intended to be kept out when the Wall was constructed.

Hadrian's Wall in the UK is unmistakably the inspiration for Westeros' Wall. The building of a wall in northern England was mandated by Emperor Hadrian in order to keep the Scots out of the Empire. It is easy to see how the Wall in Game of Thrones compares: it is 300 miles long and has been there for eight thousand years. According to tradition, the Children of the Forest later combined magic with the war under the direction of the renowned Stark lord Bran the Builder. The wall's main objective is to stop future attacks by the White Walkers, who attacked during The Long Night. The Wildings were also prevented from accessing the Seven Kingdom by the Wall. The Wall of Westeros was also an attempt at power projection and everyone south of it was the lucky ones: however, the events in the novels and TV shows have proven him wrong.