The 16th to 20th caves are the first five caves opened by Master Yu in Yungang Grottoes, known as the "Five Grottoes". The 17th cave is a Maitreya statue in the image of the Ming and Yuan emperors of Northern Wei, and the erosion is very strong. Interestingly, the past Buddha in the west is a standing statue, while the future Buddha on the east is a sitting statue.