Let us take a moment and attempt to solve the one mystery that has probably crossed through every gamer's mind at one point or the other...

Who in the world would be crazy enough to keep all those torches and candles lit in sealed-off, ancient ruins scattered across Skyrim?

Oh, that's easy - Haggar knows the answer: http://www.gamesas.com/topic/1469679-torches-are-pointless-in-vanilla-skyrim/page-2?hl=%2Bretirement#entry22919965

It's the secret guild of the eternal flame, or some such thing. Many thanks to the tireless and thankless work of these folks to help adventurers find their way.

Magic

Draugr?

Now you know what the Restless Draugher do in their spare time.

A question asked many times. CHIM.

The Phantom of the Opera when he is not lighting up the opera house dungeons.

Draugr. That's basically their purpose - to be the live-in servants of the Dragon Priest/high-ranking cult member buried in the tomb's main chamber.

http://www.imperial-library.info/content/amongst-draugr