Situated in Longmen Town, Luolong District, Luoyang , the Longmen Grottoes is a world culture heritage, a national AAAAA tourism zone, a national key historical mounment under state protection and one of the three major grotto art treasure houses in China. Construction of the Longmen Guottoes started in the Northern Wei Dynasty (386-534), continued in the Sui (581-618) and Tang (618-907) dynasties and ended in the Northern Song Dynasty (907-1127), lasting more than 400 years. According to statistics, there are over 2,340 niches in the eastern and western hills, over 70 Buddhist pagodas and ober 100,000 statues in total. Of them, the statue of Variocana is the largest , 17.14m in height; and the smallest one is only 2cm high. In addition, the Longmen Grottoes has more than 2,860 incribed steles, ranking first in all the grottoes in China. Most of the statues in the Longmen Guottoes were created in the Northern Wei and Tang dynasties, and those carved in the nearly half century from the day when Wu Zetian became empress to the year when the Tang Dynasty was replaced by the Zhou are the most outstanding. During the period, a large number of niches were carved in the Longmen Grottoes, such as the Large Vairocana Niche (also called Fengxian Temple) carved in 675, the second year of the Shangyuan reign of the Tang Dynasty; Huijian Cave constructed in 673, the fourth year of the Xianheng reign of the Tang Dynasty, which mainly holds a statue of Maitreya; and the 100,000-Buddha Cave, finished in 680, the fist year of the Yonglong reign of the Tang Dynasty. They show the artisans' sonsummate skills. The Vairocana Niche boasts the largest and generic viagra pill best group of rock carvings in the Longmen Grottoes. It ho uses a total of 11 Buddhist statues, showing a great variety of shapes, postures and facial expressions that none resembles another. They are games of the ancient stone carving art.