Subject: Can you describe magnetic pockets to me?

I am very much interested in the magnetics of our Earth. I would like to know 
about magnetic pockets, where a person might find these pockets, which ones are 
stronger than others etc. I would like to find a posable link from Edward 
Leedskalnin's Coral Castle in Florida, to magnetic pockets. I am curious if 
Leedskalnin was partly using the energy pockets to help move his coral. 
Also if you have the time point me in a good direction for sources concerning 
this subject, i would greatly apprecate it. 
Thank You very much for you time and consideration,
Lady Dantes

Re: Can you describe magnetic pockets to me?