Introduction to Emperor Yan's Mausoleum: Covering an area of ​​24 square kilometers, it is surrounded by green trees, green mountains, shades of ancient trees, and smoke and clouds. The golden walls of the mausoleum are brilliant and magnificent. The mausoleum of Emperor Yan is divided into five entrances: the first entrance is the Meridian Gate, the second entrance is the ceremony pavilion, the third entrance is the main hall, the fourth entrance is the tombstone pavilion, and the fifth entrance is the mausoleum.