Nausicaä of the Valley of the Wind.
So in order to keep introducing my 4 year old to the finer things in life and because I wanted to watch a new movie with her, we watched this together. She loved it, despite some bits I was worried would scare her and it was the first time I've seen it in years. For me this movie is weird, because I'm also a big fan of Castle in the Sky and I keep feeling like the movies are very similar to each other. After watching them nearly back to back I can see why, because they have a lot of things in common: Both show a post-apocalyptic world with airships and WW2 technology, both have a foxsquirrel and I'm pretty sure some of the music is the same too. Also, Mark Hamill plays a Jerk in both of them, though here he doesn't get quite as much screen time or billing as Castle in the Sky.
It holds up really well, and in fact, I feels like considering it's themes of the planet healing after a ecological(likely nuclear in nature) catastrophe, it feels like it hits harder considering the current ecological devastation we're seeing and going to see in the future. I haven't read the Manga, apparently it's even darker and reveals a number of important things that the movie didn't(the manga wasn't even close to complete when the movie was made), notably that the Ohm and the toxic jungle/sea of corruption was bioengineered to clean up the planet after the 7 days of fire and once it's work is done, the jungle and ohm will die so humans can reclaim the planet, but since humans are becoming adapted to the toxins that might also be bad for humanity. Apparently Hideaki Anno worked on the film, doing the God/Giant Warrior stuff, which explains why they look and feel like Evangelions, or more accurately, why the Evas look like God/Giant Warriors. And while they don't show up very often, the few minutes they are shown is quite impressive(particularly during the credits when we see brief snippets of the apocolypse/7 days of fire)