In his later years, Lao Tzu settled in Lintao, Gansu Province, and taught retired elders to practice inner alchemy, health preservation and monasticism. After gaining the Tao, he "soared" on Lintao Transcendental Platform. Yan Tao said that the Yuelu Mountain in the east of Lintao County still has such relics as "Transcendental Platform", "Talking about Classics Platform", "Flying Cliff" and "Wenfeng Tower" (also known as "Pen Tower", which is said to be the place where Laozi wrote classics and inserted pens). "Zhuangzi Health Master" records the cloud: "Death, Qin lost, out of three." Yan Tao said that this shows that Lao Zi died in Guti Road, Longxi, Qin (now Lintao County, Gansu Province), and his old friend in Qin came to offer condolences and cried three times. After Laozi took off in Lintao, Laozi's descendants flourished here. The Genealogy compiled by Emperor Taizong said: "Li sees thirteen things, and Longxi is the first." Later generations, all Li people in the world called Lao Zi "the ancestor of Taishang".