What is your favorite place to explore??

Dwemer Ruins/Blackreach. It's a shame there aren't more of them. I'm hoping for more dwemer locations in one of the DLC's.

Bard's Leap has been my favorite so far.

Blackreach is the one that really made my jaw drop. I really enjoyed exploring the whole thing from top to bottom.

Blackreach for sure. I spent several in-game days in there. I found so much crap I had to leave much of it behind.

I like the entirety of Lost Valley Redoubt. It's just so beautiful.

Yep, Blackreach, I was truly amazed when I got there it was so surreal and pretty. ^.^

The big one with big giant mushies growing in it. The magic tree cave. And the dungeon where you fall down a big hole for ages at the start of it.

to explore, definitely blackreach, the biggest by far.

About 5 minutes ago I went through Tolvald's Cave...it's an awesome dungeon.
I really like the dungeons in Skyrim. They are much better than those in Oblivion IMO.

Black Reach and Lost Valley Redoubt.

Some of the smaller caves are quite amusing as well though. Just sneak through White River Watch near Whiterun and listen to the unique bandit conversations before they see you and read their notes and diaries. Of course if you just run in with weapons blazing you will miss all the dialogue. It sure is a step up from Oblivion where every bandit hideout was rather generic.

It was the one where you have to get a sapling for a certain quest. Absolutely amazing cave. Blackreach was pretty good and it reminded me alot of a mod (blanking on the name of it) for oblivion that added huge underground caverns and settlements. It had drows and stuff as well.

I`ll try to give nothing away but I was in a ruin investigating some quest. It was a nice ruin, it looked like it was a nice castle once. I sneaked in through the open gate - ZAP! Killed by trap. I was impressed by that cos it was the first trap I`ve ever come across that was cleverly placed outside the ruin at the entrance. I totally wasn`t expecting that and I`m VERY wary of traps. Some Bethesda staff are quite crafty with their trapping sometimes...

Anyway ventured in (on Reload) and came across more traps well placed. I made a note and carried on. then I was attacked by 3 powerful mages- Wow! they zapped me within an inch of my life. I got away by the Speed Shout to where I saw the traps and triggered them. This was my emergency backup plan I always have.

The traps fired gouts of burning flame killing all 3 mages, which was nice.

So that`s my favourite ruin at the moment.

I can't remember a single name apart from Blackreach, I don't really remember dungeons as they all merge together into a blob.
As to what theme I like the most? Ice dungeons, Draughr and Vampire/Necromancer probably.
Absolutely loathe dwemer dungeons though, they are so bland and repetitive.