My favourite series is Full Metal Alchermist!

WHY?
Well because it AWESOME!!!
The 1st thing that makes FMA stand apart is that in its world there is a sort of "Scientific Magic" called Alchemy, which allows the people who study this branch of science to decompose matter and rearrange it as they deem fit with the use of transmutation symbols and cirlces.

But the story of the Elric Brothers and their journey seeking the philosopher's stone to recover their full human bodies which they lost at a very early age trying to resurrect their mother through the forbidden human transmutation...takes them to many places in which they learn many lessons about life and principles of the universe...ultimately uncovering a whole conspiracy where artificially created beings called homunculus are planning to rob the lives of their entire country to fuel their existance....And how is that ultimately related to the Elric Brothers and their mysterious father's past.

It's a really great story with cool characters design and many thought provoking moments.