Ordinary streets extend from there,
And every so often, a new wall encloses everything.
The city has probably expanded gradually over the years.
Layers of new walls were added to accommodate the expanding city.
However, the city walls stopped after the fifth layer.
From that point on, the buildings simply sprawled out in all directions.
Going beyond the horizon.
It was getting too expensive to build new walls,
So in lieu of walls, knights are instead assigned the work of subjugating the monsters regularly.