These massive, ancient designs are one of archeology’s greatest mysteries. https://on.natgeo.com/2KGZaU1 pic.twitter.com/ki58oHWFQk

These massive, ancient designs are one of archeology’s greatest mysteries. https://on.natgeo.com/2KGZaU1  pic.twitter.com/ki58oHWFQk

https://twitter.com/NatGeoTravel/status/1028959349345902593