Elder Scrolls IV: Oblivion is a first-person perspective fantasy computer role-playing game set in a vast 3D world with an open-ended storyline that allows the player the freedom to pursue the main quest, side quests, or simply explore the world. The game is set in a different geographic location from the previous in the series (Elder Scrolls III: Morrowind) and in general the architecture and wildlife is more medieval and real-world. The fantasy game art is vastly improved, however, and at the time of its release wowed the world with its realism and attention to physics in its interactivity.
This Elder Scrolls IV: Oblivion fantasy art / game art page has images from a graphically modified game. For an overview of the major changes, click here.
The Oubliette is a mod with generally excellent horror-setting style environments. We have an in-depth review on Grail Quest Game Cheats and Mods Archive.
This screenshots page covers the areas accessed by door 3, "Death's Domain" -- Where the horror is in not being able to find a way out. Others have tried and continue in death to futilely try as mindless zombies. We also meet Death and are offered a bargain, but its effects are sadly unclear.