After finally discovering all the locations in one game, I think I can finally make a list for the most difficult dunegons in Skyrim. The majority of the locations in Skyrim are not exceptionally challenging, but this factor makes the dungeons in this list much more unpredictable. Keep in mind, this is my own list based on my experiences with the locations in question and i expect everyone to have a different top 10. Also of note, I completed most of these dungeons while i was level 50+.

10. Labyrinthian- While this dungeon is not too challenging for most character builds, the fact, that this dungeon is frustratngly long, and that it is mostly completed by mages, gets it on this list.

9. Morvunskar- It is filled with mages and you will most likely be outnumbered when fighting them, nothing more to be said.

8. Hag Rock Redoubt- This location puts you against a large number of Forsworn, often simultaneously. Fending off the melee-Forsworn, while avoiding arrows and spells is no easy feat.

7. Lost Valley Redoubt- This massive outdoor ruin puts you against increasingly difficult fights against the Forsworn, as you make your way to the top of the ruin. At the end, you will face a Briarheart and two Hagravens at once.

6. Liar's Retreat- Oddly enough, this small sized dungeon is most difficult at the very beginning. You will propably end up fighting four-to-five Falmer at once. If you are a Two-Handed specialist, then I highly recommend going there for the Longhammer. This dungeon would be higher, if it weren't for it's short length.

5. Lost Valley Redoubt- This huge outdoor Forsworn camp will get you slaughtered if you try and rush in recklessly. The sheer number of levelled Forsworn will make for some epic battles. this is one of those occasions, where the Call Dragon or Storm Call Shout really shine.

4. Ansilvund- This dungeon is filled with mages and Draugr, who you often have to fight simultaneously. The final fight against the boss-mage and levelled Draugr got me killed many times on several characters.

3. Tolvald's Cave- What initially starts out looking as a typical animal den, ends up as a long dungeon run filled with Falmer and their pets. Most of the time you will be outnumbered against levelled Falmer and their unlevelled counterparts (which are still unusually powerful for their level). Visibility was also pretty low, so I had to rely on Torches to find my way. It was also pretty easy to get lost there, which added to the time i spent there.

2. Skuldafn- The difficulty in this dungeon is contributed mostly to the fact, that almost all of the Draugr you face, are levelled. There are also Dragons lurking around in the area, making for more unpredictable and challenging fights. If it wasn't for the somewhat lackluster boss fight, then this dungeon would certainly top the list over...

1. Forelhost- Easily the most difficult dungeon for me. I know you can skip a significant portion of it with some skill in Lockpicking, but that does not make the final fight against the Dragon Priest and four Deathlords any easier. The place is long and there are Deathlord snipers around every corner. the average time I spend there is about an hour, way longer than any of the other dungeons. You are well rewarded for your efforts however- the Dragon Priest Mask, his staff and a word from the Storm Call Shout make the trip worthwhile. Going through Forelhost is one of those things you can safely put on your job resume, no matter the job you apply for.

What are your picks for the Top 10 most difficult dungeons in Skyrim?

Removed the double post.

Forelhost is the most difficult to me, and therefore the most challenging, plus my favorite.

Any dungeon with Falmor in it is challenging due to the lighting and their pets. Plus the Falmor can show up anywhere. In front of you, behind you, right along side you. They are scary the way they can pop up.

Skuldafn is another filled with deathlords and a few dragons. The entire outside has to be done with sneaking or one will be swamped with deathlords. There are at least 13/14 on the outside alone, plus 2 dragons. Inside is a little easier, but not by much.

Any dungeon with a dragon priest in it is challenging for all the draugr and deathlords one encounters.

Any dungeon with Forsworn can be challenging for they are somewhat fierce.

I did not list all the names of the dungeons, for there are way to many. Playing as a sorceress, (mage), I do not have followers and all my encounters are by myself except for what I conjure to help in a battle. Therefore any dungeon I go into in a challenge. But Forelhost is by far the best and most challenging of them all.

Totally agree with Ashley, Forelhost is the Daddy!

I still to this day do not know if the dungeon resets/respawns, and one day I will test it out to see. It is one dungeon that I would not mind repeating, for one can really test their skills in that dungeon.

I've never tried to redo it either. If you do let us know what happens!