Well since there aren't any that I can see, I can't think of a specific example. In a sense the idea is hypothetical. Imagine that we had shown definitively that the Universe was self-contained and needed no Creator, nor could it have had one -- or, equally, imagine the exact opposite. Then we can "know" God through His creation, or know that he isn't there because he is unnecessary. Rather like Paley and the watch, really. That "proof" of God breaks down because what it ends up saying is that God can't make watches, but the idea is still reasonable, I think. If you found a watch, you would at least know that whoever made it was capable of achieving something like that. If you found that the Universe had to have a creator then you would know something of that Creator's abilities. We aren't at that point, yet, and perhaps never will be, as there is still much to understand about how the Universe works.
More easily of course, since God is meant to be able to work miracles, then we can know of him through any such miracles. But there's no sign of these in the modern world, and such stories are there are tend to be from people who don't fully understand what they saw.
So those are the works I have in mind. Not seeing God, but seeing His influence somehow, and when we do see it, see it in a way that cannot now or ever be explained otherwise.