Located approximately five kilometers from Khao Wang, this cave is regarded as the largest and the most beautiful cave in Phetchaburi. Apart from beautiful stalactites, the large hole on the ceiling allows the plenty of lights down to the cave floor creates the stunning scene in the cave. This cave also houses a Buddha image cast under the royal command of King Rama V as a dedication to King Rama III and King Rama IV. At the foot of KhaoLuang Hill, there is a large monastery locally known as Wat Tham Klaep or Wat Bun-thawi. Attractions within the compound are a large multi-purpose hall and a ordination hall laden with beautifully carved door panels.