Did I hallucinate this speculative future doc?

So, I’ve just watched ‘The Future is Wild’, a documentary-style film exploring a hypothetical evolution after the disappearance of humanity, five, 100, and 200 million years in the future. I did like it fairly well, and thought I might want to check out similar ‘hypothetical’ documentaries (however you’d want to call them), and I distinctly remember reading about one that dealt with the near(er) future, more specifically, with how what remains of human civilization is being re-claimed by nature, what would last how long, and things like that.

However, neither IMDb nor google was any help in tracking down the film, and by now I wonder whether I’m not just confusing something else with ‘I Am Legend’, or something like that.
So, does this film exist, or am I just making things up again?

And further, are their other pseudo-documentaries done in a similar vein? I remember one that dealt with hypothetical ecosystems on three different planets, I think, which I saw and liked, and then there’s also ‘Walking With Dinosaurs’, which I think I have seen but can’t recall much from.

I think you’re thinking of Life After People from the History Channel.

Yes! That’s exactly it. Many thanks!

I’d been under the impression that it was called something like ‘The Future Without Us’, but all that turned up was a flic called ‘The World Without U.S.’, which apparently tries to paint a picture of the world as it would be if the USA suddenly disappeared… Has anybody seen that one? Is it worth watching?