Introduction to the front hall: The front hall is the main palace of Afang Palace. According to historical records, it is 500 feet from east to west and 50 feet from north to south. It can seat tens of thousands of people on the top and build a flag of 50 feet below. There is a huge rectangular rammed earth platform, starting from Gucheng Village, Jiyang Township, Chang'an County in the west and ending at Jujiazhuang in the east. The actual length after detection is 1320 meters, the width is 420 meters, and the highest point is about 7-9 meters high. It is the largest platform in China at present. The largest rammed earth building foundation in the world.