During our trip to Washington, we traveled through Arizona's Petrified Forest National Park. Here are some Petroglyphs contained within the park. It is also home to another "Newspaper rock".
I once heard someone say that if we were to disappear today, the future generations would have nothing solid to figure out our technology or history. Our books and computers would not survive as long as these petroglyphs have. It seems our ancestors had it right, if you carve the important stuff in stone, it will be there forever. Makes you wonder what they were trying to say to the future generations. Makes me wonder what I would say in stone if given the opportunity.