Tham Khao Luang is a large cave consisting of three linked chambers and is distinguished by many hanging stalactites and Buddha images, including a phra non or reclining Buddha. The main bronze image was cast on the orders of King Chulalongkorn (Rama V) and dedicated to his illustrious predecessors, Kings Rama III and Rama IV. There is a natural opening in the ceiling of the second, main chamber, through which daylight streams illuminating the images within.