Been reading the recent in-universe 'World of Ice and Fire' book for the past few days. Very interesting. It is a very mysterious, detailed, and complex world Martin has created, both in and beyond Westeros. The stuff I like the most are about the lands in the far east. Since they're so far away they are portrayed in such a mysterious way and are endlessly fascinating and intriguing. I have also been jumping from page to page in the Ice and Fire Wiki, trying to learn as much as possible about those weird eastern places. Awesome stuff!