What are the best exploration based games on PS4?

At first glance the world seems simple. Tribes-folk living in beautiful landscapes of snow, sand, and lush green, trying to get by through hunting and gathering. Then you get introduced to the other inhabitants – the machines. It suddenly makes you wonder about their origin, their appearance and their purpose. What lead to their creation and why did civilization regress to pockets of tribal settlements. You'll be interested in exploring the world and finding out for yourself.