THE LONGMEN GROTTOES - 2,345 Artificially Carve Caves in China.
The Longmen Grottoes are home to 2,345 artificial caves, 2,800 inscriptions, 40 pagodas and about 100,000 Buddhist images. 30% of the caves date from the period of the Northern Wei dynasty, while 60% is from the Tang Dynasty period and the other 10% is from different periods. the 2,345 artificial caves were excavated, thousands of years ago from the limestone cliffs of the Xiangshan and Longmenshan mountains.
The Longmen Grottoes were built between centuries V and VII, when the Wie dynasty moved to Louyang, resulting in the sculpting of more than 100,000 images of Buddha inside a limestone mountain, becoming one fo the best examples of Buddhist art in China. See - very interesting site.