WARNING: This anime is highly awesome, watch at your own risk
Hilarious, brilliant and educational(?), Hetalia is amazing. The characters are all countries, and are complete stereotypes: America loves hamburgers, England is a terrible cook etc. The story is about various moments in history, although initially it is centred around WW2, as well as having some random episodes that have absolutely nothing to do with anything but are hilarious nonetheless.
Hetalia is basically the best, most hilarious history lesson you will ever have (although most of the stuff you learn is pretty useless...), and afterwards you will never look at the countries or history the same again.
I would recommend this especially to anyone who likes comedy or history, but it has something for everyone. If nothing else, just watch it to see how awesome your own country is (mine has the best eyebrows ever and is friends with a flying mint bunny. Who could ask for more?)