Does anybody remember the Fang Lair? An ancinet Dwemer citadel in Hammerfell.

""It is said that Fang Lair was originally built by the Dwarves of Kragen. Legend has it that a Great Wyrm drove the Dwarves from their home in the Dragon's Teeth, and took the Lair for itself. I only wish I knew the exact location. Perhaps there are sages, or scholars, who would know of this place."

It was probably built by the Rouken Clan. The backstory seems like a tribute to the Hobbit - the book written by J.R.R. Tolkien. It would be an interesting location to visit, especially if there was a dragon there. It was where the piece of the Staff of Chaos was, so it's at least a very important dungeon in Hammerfell.