Mount Grenfell Historic Site is an Aboriginal rock art site, about 70 kilometres northwest of Cobar along the Barrier Highway in the arid lands in central west New South Wales, Australia. Travel 40km on the highway and you’ll see the turn off to Mount Grenfell. Go about 30km’s down the gravel road to the entrance. The road is easy to travel though has no lane markings. The last 1km is currently a dirt road and not recommended for caravans.