So, I was playing Skyrim earlier this week. I go to Jorrvaskr, guess who I see sitting there at the table inside?
*** Skjor. It was after his death and he's just sitting there minding his own damn business.
Screw that ***. He's dead. Again. His corpse disappeared into the floor, so I tcl'd and started walking down through the floor to see if I could find the body. Nope. No body there. However, I did find a funky hidden room I didn't know was there. Big, empty room with no doors. What the *** was it supposed to be used for? I now have an unanswered question that'll haunt me forever.
Usually they are for disembodied voices or for vendor chests.
In the Namira quest, if you use detect life, you can see the NPC used to project Namira's voice through one of the walls.