Locally known as the Pahiyangala caves, these caves had been used by prehistoric cave people of 37,000 years ago. The cave is best known as the largest natural rock in the region as well as the oldest pre-historic settlement on record from the Asian region. Archeologists found five human skulls which date (carbon dating) 37,000 years and had short vertebral structures as well as wide jaw bones and of course large grinding teeth to suit the diet of the day. Further, excavation had revealed stone and animal bone hunting equipment. The history of 'Fa Hien Caves' continues with records of a wandering Chinese Monk Fa Hsien's visit to the caves in the 5th century BC. Much later, the cave had been turned into a Buddhist temple by a Sri Lankan monk who according to legend was a man of immense strength. The common estimation is that the cave can easily accommodate around 3000 people.