Find a sentence to describe the ancient city

The sentence of the ancient city was as follows: This city was a huge castle, towering and towering. The walls were tall and upright, and the battlements were crisscrossed. All kinds of firearms were installed on the walls to defend against external attacks. The streets of the city were spacious and the houses were neatly arranged. The pavement was paved with bluestone. Pedestrians shuttled through it with caution. The city was surrounded by a moat. The river was clear and the river banks were high. Every few kilometers, there were navy banks to prevent the enemy from attacking the city. There were still hundreds of thousands of people living in the city, living a peaceful and comfortable life.