(Obligatory "I wish we still got pack-in material in the new games" "Oh, I wish we still got - you know - packaging these days")
doom 3 is all narrow corridors and pitch darkness. they created a very impressive-for-the-time dynamic lighting engine to be able to hide the monsters, made it so you couldn't have your gun and your flashlight out at the same time, and had all interaction to open doors and such be done through virtual screens with a mouse-driven interface so you couldn't look away. it is very much so horror.