Well you can't put too much stock into the History channel these days when one of their few active shows that isn't reality tv based is about aliens coming to Earth and interacting with the primitives.
I watched a couple of episodes of Life After People and it was interesting. The only thing I shrugged at is anything big enough to wipe all of us out is probably going to level any structures we have anyways. That doesn't mean that all -evidence- that we were here is going to be gone.
Yes pavonis, we all know the difference between bones and fossils. You don't need to nitpick pointing it out when we use the terms interchangeably considering the topic of discussion.