The Fa Hien cave is an important archaeological site, known for findings of human skeletal remains from the late Pleistocene period. The oldest fragments of human bones are the skeletal remains of three children and two adults. The findings have brought the evidence of " secondary burial" ( dead bodies were first kept exposed in the jungle, and they were placed in graves only after they got decomposed and "cleaned" by predators. The locality of the Fa Hien cave was inhabited about 33,000 – 4,750 years ago. It is named after a Buddhist monk Fa Hien.