For a collection of the most iconic photos of the last 100 years, I thought it was pretty biased in favour of only the last few years. And I don't recall seeing anything from the Vietnam era, apart from the one "flower power" one. No burning Kim Phuc running down the road? No evacuation of Saigon? Like or hate Vietnam-era politics, there's no denying the visual impact of those photos.
For that matter, where were the mushroom clouds? Astronauts on the moon?