New genetic research reveals who were the mysterious people buried across Thailand in giant wooden coffins on stilts 2,300 years ago. Dozens of caves are scattered in the highlands of northwest Thailand, which will turn out to have a number of very intriguing human graves from the distant past.

It turns out that about 40 of these burial sites are a trace of a mysterious culture that lived in the Iron Age and inhabited the Mae Hong Son province in northern Thailand. The study illuminated the complex genetic landscape of post-Stone Age Southeast Asia.