I have heard that a question often asked by visitors to the Grand Canyon is "What tools did they use?" I do not know how the park rangers answer this, but I think I would be speechless.

It turns out that among those who assume that the Grand Canyon is artificial, some think it was built by indigenous Americans for religious purposes, and others that it was cooked up during the New Deal as a way to reduce unemployment. No doubt it would serve admirably either way.