Game of Thrones' third season premieres March 31st, and the HBO is whetting appetites with a featurette that ran before last night's season finale of Boardwalk Empire. "We always envisioned Season Three as sort of the place we needed to get," says producer-director D.B. Weiss. "If we've made it through Season Three and we can do Season Three right, then it will be all worthwhile." For the next series of episodes, based on the first half of A Storm of Swords, the cast and crew introduced some new locations, including sets in Iceland and Morocco. "What keeps it fresh is it's such an expansive world," says Weiss. "It's such a rich, endlessly fascinating world that you can lose yourself in it."