Is it Nature or Nurture, congenital or acquired? The answer is actually quite simple: everything is Nature and Nurture. The structure if the brain determines what we can learn and what we learn determines the structure of the brain.
London taxi drivers know every street in London, as well as all the restaurants, post offices, shops and more. In our brain there is an ingenious GPS. And this GPS is integrated with our life history and emotions. Try doing that with a navigator!
What is the boundary of your body? Where does your body end? All fairly clear to you, but not to your brain. A rake you hold in your hand can become a part of your body, and sometimes a rubber hand can seem like your real hand. How can this be?