Stone Mountain is a large granite dome, but it is not the largest piece of granite in the world. That title belongs to Mount Augustus, located in Western Australia.

Here's a comparison:

* Stone Mountain: Approximately 5.85 miles in circumference and 2,500 feet high.

* Mount Augustus: 16 miles in circumference and 1,695 feet high.

While Stone Mountain is certainly impressive, Mount Augustus dwarfs it in size.