hopefully this isnt too much of a spoiler by saying what i like about these environments so i wont give too much detail in case...
i just want to tip my hat to bethesda for the awesome work they did on thelandscape/cells for the dragonborn questline, particuliarly the apocrypha regions. very lovecraftian and gothic, which mix very well into an eerie otherworldly experience. the environment matches the domain of the daedra perfectly too