I don't know why, but after - oh, I don't know, it must be close to 400 hours now, I still haven't met the Jarl of Dawnstar. I just never had a reason to go there, it seems (I've
been to Dawnstar, but not much. It's so - off the road from everything). And I still haven't figured out where the Temple of the Divines in Solitude is.
Of course, there are still many things I haven't done at all. The DB or CoW questlines, for example. Lots of caves and ruins I just pass by, thinking "some other time". Half of the Daedric quests. Probably a whole lot of sidequests. I have never owned Prouspire Manor or Vlindrel Hall. And just a few days ago I visited an Orc stronghold for the first time.
I
did have my first dragon inside a walled city a couple of days ago, though. Twice in a row, actually, with different characters, both times in Windhelm. First time was a bit of a PITA, since that character is low level (7 or 8 at the time) and a pure mage, with only a few spells and practically no shouts, so it took quite a while before the dragon landed.
Which back doors?

Guess this is another thing I didn't know.
I came through one of those backdoors on my very first visit to Solitude in my first playthrough, causing me to totally miss Roggvir's execution. Made the NPC dialogue a bit weird.