Introduction to the Mausoleum Gate: The Huangwang Mausoleum originally had inner and outer city walls. Now the outer city has been destroyed, and the inner city is located at the mausoleum gate. The outer city wall is 1,200 meters long from north to south and 800 meters wide from east to west, covering a total area of ​​960,000 square meters; the inner city is 206 meters long from north to south, 80 meters wide from east to west, and covers an area of ​​16,500 square meters.