For the first batch of national key cultural relics protection units, known as the world's first mausoleum . It is the mausoleum of Xuanyuan, the ancestor of the Chinese nation. According to legend, the emperor of the Yellow Emperor ascended to heaven, so the mausoleum is a tomb of clothes and crowns. The ancient cypress group in Huangdiling Mausoleum is the oldest, largest and most complete cypress group in China, with a total of more than 80,000 plants and more than 30,000 plants over a thousand years. It is known as the father of cypress in the world and the crown of cypress in the world .