4,300+ hours and I have only just found Hilgrund's tomb.
I really enjoyed the quest you have to do in there.

anyone else still finding new things.

I have found every location there is on Skyrim and Solstheim, so nothing new there for me.

I'm sure you'll have some places to still find, even if they are unmarked locations.

There's probably loads of locations out there waiting to be discovered in my game. I usually explore the map in patches.

I have found every marked location there is. There maybe some unmarked, but I bet I've found the majority of those.

I'm pretty sure I discovered every Location at least once, and in about 16% of the time you've been playing, without HUD on. o.o

All that is left for me is Glitches to find that bring me convenient pleasure.

Well, 4,290 of those hours been played in Helgen, then making another new character every 2 hours, you'd be surprised of the things you find outside of Riverwood.

Same here. Also, apart 30 characters and haven't found shalidors maze sine character number one.

I'm still finding things in Oblivion. I doubt I'll ever find every location in the game. Mostly because I stay on new characters, so the locations I find are repetitive.

I wonder, is there something interesting at the top of the mountain next to Castle Dour?

Same. It's a shame too, since it was such a good game and I loved exploring. Oh well, it gives me time to write my book/short stories now.

I can't remember, but go up there and check it out anyway. Exploration is half the fun for me in Skyrim.

I don't have as many hours as Michael - appr. around 1100-1300 - but I definitely still find new locations. Of the clearable dungeons I think I've done about 2/3, or maybe 3/4. (I've found more than that without clearing them, but far from all.)

And I haven't bought Dragonborn yet, and still haven't played through the DG main quest. So I still have lots of things to do!

I hit 500 hours on my current character and I barely found some caves I never discovered before. It was pretty cool. I'm in the process of walking every nook and cranny Skyrim has to offer. I wanna check out the Soul Cairn more thoroughly too