Within the boundary of the temple is a mountain with numerous caves. Tham Yai is located at the lowest level and, inside, the total length of the cave walls is decorated ceramic tiles, bowls as well as terra cotta ware and Benjarong ware. It is also used as a temple and houses various manners of Buddha images, one of which is a splendid reclining Buddha image. You can also see many Royal Monograms inscriptions on the walls of the cave.