So I've been playing through Xenoblade Chronicles, and I forgot just how much I love the design of all the locations in this game. Music does a lot to help set up the atmosphere in these locations too. So good.

Anyways, I was just curious what your favorite video game worlds are to explore, and what is it about them that makes them so good to you? Are they just aesthetically really pleasing? Is the world building great with lots of books or items to find to help build some great lore? Is it just the characters or monsters that make it such a fun place to explore? Discuss!