Aboriginal Rock Art - Western Arnhem Land by Chris Borough Via Flickr: Bandicoot More Arnhem Land images in Album Arnhem Land Without doubt the "Catacombs" at Mount Borradaile in Arnhem Land would be the most memorable place that Australia has to offer. Difficult of access, Davidson's Lodge at Mount Borradaile has a lease over 700 sq km of wilderness and is only available to a limited number of visitors. The "Catacombs" - located nearby - have been formed in Pre-Cambrian sandstone rocks that have essentially lain unchanged for around 600 million years. The sandstone has been eroded by wind and water creating a massive cave system that is peppered with unbelievable Aboriginal art. Evidence suggests that aboriginal people inhabited these areas 40,000 years ago. The artwork appears to been made after the end of the the last ice age - around 10,000 years ago.