It's all good, but it really doesn't matter what you believe unless you are who put them there. How many megalithic sites are you aware of? Sphinx, pyramids, Stonehenge...there are many...all in stone. There is a reason for that. One day some time in the future all our skyscrapers will be so gone there will be no sign they were ever there...same with everything of steal...everything but stones. A future generation will find granite headstones everywhere and be amassed at our ability to carve stone, and they will speculate as to what they could possibly have been used for. And there will be this.