Steampunk! Almost anything with a steampunk aesthetic is awesome. Throw in some dystopian society and militarism and you’ve got a great recipe for an anime.
There are quite a few series that take the route of a post-apocalyptic future, but none do it quite as well as Now and Then, Here and There (Ima, Soko ni iru Boku). Its mix of the horrors of war, child indoctrination, and futility leaves the viewer in awe and robs the viewer of all hope by the conclusion. And this is exactly where this series’ genius lies. For my full impressions, read on.