By the title I mean anything, really.
For me, it's probably the Dwemer lexicon thing quest

Blackreach.

An NPC that didn't say arbitrary lines every time I went near him.

Oh, my.

'ekoj lol' its a backwards mind**** item, you'll see what i mean

Philter of the Phantom...i wish it had a Recipe so i could make it. I could base an entire character around it

Hahahaha, very clever

The Sleeping Tree sap tree. I think it's weird to have the tree without any quest tied around it. At least I haven't had a quest tied to it. I like collecting the sap though--kinda' like honey.

My husband found a door in Solitude spelt wrong the other day. They spelled it "Dour" not "Door". Its the door to where you go to join the Imperial Legion.

Go in the cave next to and find the dead orc...there is your quest start. Check him for a note

The place is called Castle Dour, not door

From http://dictionary.reference.com/etymology/dour:

"Word Origin & History
dour

late 14c., "severe," from Scottish and northern England dialect, probably from L. durus "hard" (see http://dictionary.reference.com/browse/endure); sense of "gloomy" is late 15c." -- dictionary.reference.com

Was wondering around during a snow storm on a mountain found this stone alter

I was going to name something else until I remembered this.

so, yeah...this.

I found a skeleton lying on a stone slab table in a mountain pass. Well, you could take the skull, but it was called 'adventurers skull'. I thought that was interesting. I meant to look it up on a wiki but never did.

I have encountered some imperials, full in imperial armors. They're slayed citizen in the mid of the night. And when I approached them, they said I'm in the 'off-limit' area. Then they asked me to pays, and when I said 'I don't have money rightnow' they was tried to kill me rightaway!
I tried to searched this on the wiki, but never found this. Their location is in the plain just west of Whiterun, near Shrine of Zenithar. And when I searched them with different character, I'm never found them. Even in the same place.

The fact that the waters of Skyrim seem to be lowering due to melting. Rock formations appearing where ice and snow were covering landscape in previous versions. Even a seemingly deteorization of the Mages College foundations in the surrounding landscape.

I've found a couple of places that seem like they 'should' be something, but aren't.

Example: close to solitude, on your way to the Thalmor embassy, there is a set of old nord steps and partial ruins going off to the northwest. But they go...........nowhere. They seem to dead end into a granite cliff face. Why?

Also - there's a pass going south thru the mountains from Winterhold to the March. Not only is there an altar in the pass that doesn't seem to have any reason for being there, but on the mountain to the east, all the way on top, is some sort of Dwemer........thing. I don't know if it's a viewing balcony, an altar, a place where they use to have a sun deck, spa and bar with little drinks with the little paper umbrellas or plastic mermaids in them...........WHATEVER. It's there, and doesn't seem to serve any obvious purpose.

Another: there's an Akatosh shrine in the southeast corner of the East March, on a stony hill just inside the geyser plain area. Unmarked on the map, but there. Why?

YET ANOTHER: A dwemer ruin in the far eastern mountains that appears to be like any other, but instead leads to something that I won't talk about - suffice it to say that you'll never forget it. But it's very uncharacteristic of Dwemer stuff. What's the deal?

I could go on.

There's LOTS that could still be done with the various ruins, caves, crypts and stuff in Skyrim. TONS. It's DLC HEAVEN for modders.

I'm fairly certain that they spawn randomly and they aren't actually Imperial Legionnaires, they're more like highwaymen in my experience.

My most interesting find was discovered when I was exploring just north of Fellglow Keep and I stumbled upon skeleton that was half-buried in the snow; what made this interesting is that it was hugging a shrine of Julianos.

The skeleton with a cloak somewhere outside of Whiterun near some unmarked ruins.


Also running into Deepens-His-Cups after Sams quest. That was cool.

I found a burnt corpse...but the funny part is I found a summon flame atronach scroll by him. Must've went totally wrong

Oh yeah, sometimes on the road I encountered the Old Orc. He told me that he wanted to found a good dead. And if I said can gift him a good dead, the fighting started.
NOTE : becareful if you give him a good death but still level 1-7 cause he is extremely strong.

Pretty much this.

When I first entered blackreach I was like "Holy crap."

Easily my favorite area in the game.