If you liked the Adolf manga, the Anime-Planet community thinks you'd like:
Dr Kenzo Tenma is a genius surgeon working in post-Cold War Germany who has a bright future ahead of him. He is admired by his colleagues, loved by his patients, and due to marry his boss' daughter, the beautiful Eva Heinemann. One day, when two patients in desperate need of emergency surgery are wheeled into his hospital, Tenma faces a terrible choice of saving the orphaned boy who came first or the mayor of Düsseldorf, whose recovery would raise the hospital's profile and boost his own career. Against the demands of his superior, Tenma does what he believes is right and saves the child. However, his decision not only damages his prospects, but unleashes a chain of events so horrific that it might have come from the depths of his worst nightmares. Laden with guilt, Tenma begins a journey across Germany in search of a formidable young man who will challenge his morals, his love for life, and his very sanity.
Naoki Urasawa is highly influenced by Osamu Tezuka, which is fairly apparent when you compare Adolf and Monster.
Both start out about a Japanese man in Germany (either during WWII or shortly thereafter), but soon add oodles and oodles of characters, a plot rife with suspense, and tons of twists.
Both are epic, though Adolf's age is readily apparent.