....This is one thing I like about dungeons in Cyrodiil: yes they are sparser, and aren't packed with stuff (as Skyrim's lairs are) but oftentimes Cyrodiilic lairs will feature areas with multiple directions to go in. They challenge us to remember which way is the right one!
We might come to a room for instance that has 2, 3, 4, 5... I've seen up to 6 or 7 exits! Which way is the right way? ... I used to wind up going in circles in some of Cyrodiil's: especially caves and Ayleid ruins. Forts aren't as hard, but also could offer some twists and turns, and if the player (me) was not using the map, all a sudden I could be seriously lost for hours!

This thread is going to be dedicated to those lairs in Skyrim that have the ability to get us seriously lost. Mycharonna the Ice Witch is in one such lair at the moment. It is called
Fallowstone Cave
There is a quest related to this cave but I won't spoil. Anyways, this is a big cave, with one very large main cavern. And it's not so much that there's multiple directions to go (multiple exits, that is) that the cave is just so large, with all sorts of ledges to climb upon. There are also some side exits here and there. I think I've found three so far. I won't spoil, but they do lead to some interesting little things!
Anyways, if anybody has other such places that they've found, I want to see what others have discovered.
Shriekwind Bastion
Fort Neugrad
Alftand
Nchuand-Zel