I was going around the Northern part of Skyrim today and I came across a skeleton next to ~8 gold ingots. He was on an iceberg/island in the very far northeast..how you guys found anything similar at locations that weren't marked? Anywhere in the game I guess.
Tons of stuff like this. I find more every time I start a new character. I just recently found the skeleton you're talking about for the very first time, and that's after nine months of playing regularly.
Also on the north coast, east of Dawnstar, is a tent where two lovers were having a rendezvous, possibly on their honeymoon judging by what you find inside. I've never found any clues as to what happened to them but maybe I just haven't looked hard enough.
Found a Talos shrine once that I'd never stumbled on after months of playing, overlooking a little pond. Even got ambushed by some Thalmor there when I went back to check it out more carefully.
Heck there are several locations that do get marked on the map that I've never discovered yet.