History Manga

A good way to learning Japanese is by reading manga. Of course there are thousands of manga in Japan and it can be very difficult to choose the right one. Some are written in slang (i.e. teenager talk) and may not be appropriate for your linguistic goals.
I picked up a manga that presents the lives of historical personalities in the world: from Alexander the Great to Cleopatra, Napoleon, Kennedy, Van Gogh etc.
I can now learn Japanese while I brush up my history knowledge.