China's four major grottoes, Longmen Grottoes, Maijishan Grottoes, Yungang Grottoes, Dunhuang Mogao Grottoes, have been to three, this summer vacation to strive to make up four. This time I want to say that Yungang Grottoes are more beautiful than expected and spectacular, especially the fifth grottoes. It's simply great! If you haven't been there, you must go and see it. It is best to go in the afternoon. One is that there are few people, and the other is that you can just see the sunset on the big Buddha. It's great.