Birthplace of the Wicca religion?where did it start?

Please help! school project... i know who started it and when. i just don't know where in the world it started, (ive been looking on the internet for at least an hour, but i can't find it, and i can't go to the library 'cause my parents aren't here). um also if you know where the largest concentrations are located or any significant sites that would help too, cause i can't find any of that either. Links if you've got them. please help!