If I had to name my three favorite game worlds, it would be Riven, the D'ni Cavern and Morrowind. For those of you unfamiliar with the name, Morrowind was the the third game in the Elder Scrolls franchise. It's particularly notable in my mind for its weird and original story, lore and art-direction which blended fantasy with sci-fi against an elaborate contextual backdrop of sci-fantasy religion and political intrigue. What I love most about it was the care put into crafting a believable rich alien world with its own set of customs and laws.
A large portion of the design and writing was done by Michael Kirkbride who I consider as the "punk vander wende". Check out his tumbl here: http://michaelkirkbride.tumblr.com/archive
For an overview of the style of the game, check out this video: https://www.youtube.com/watch?v=d69wYi3_LWo
...and this is a fan total conversion remake in the Skyrim engine: https://www.youtube.com/watch?v=WNLo1qd ... KWVM7b2a5A
Development video: https://www.youtube.com/watch?v=uJwpaVw ... 69dKD-lRTg