Hope to help the landlord: Longshouyuan, located in the northeast of Chang 'an City in Tang Dynasty, was the political center of the Tang Dynasty empire for nearly 300 years. This palace was built in the eighth year of Zhenguan (AD 634) and was originally named Yong 'an Palace. In the second year of Longshuo (AD 662), Tang Gaozong ordered the expansion and moved into Daming Palace in the second year. In the third year of Ganning (AD 896), the palace was destroyed by soldiers. The circumference of Daming Palace is more than 7.6 kilometers. The area is about 3.2 square kilometers; It is four times the size of the Forbidden City in Beijing. Miyagi has 1 1 city gate, and there are three sides: east, west and north. There are three palace walls in the south, and Danfengmen Street outside the wall is176m wide. It is the most magnificent palace complex in the Tang Dynasty, and it is also one of the most magnificent and largest palace complexes in the history of the world. The picture on the right shows a bird's-eye view of Daming Palace scientifically restored by Mr. Yang Hongxun, an architectural archaeologist, consultant of UNESCO and academician of Russian National Institute of Architectural Heritage, based on the archaeological research results of more than 30 years.