Introduction to the first floor: The first floor in the world was formerly known as "No. 1 Lou", which dates back more than 600 years. Emperor Jianwen built it to thank the local Lou brothers for leading the way. The three characters "gate tower" are said to be written by Emperor Jianwen himself. The first floor is an ancient Chinese courtyard building style with carved dragons and painted buildings. It is now a teahouse and inn.