I haven't seen any yet
Haven't really wandered too though. But can they appear whenever, wherever in the game? Don't I have to 'unlock' them with some kind of quest first?
I'm doing the first big mission of the main quest now, and it has something to do with the dragon language, so I'm pretty sure after this I'll encounter a few.
Unsure if they just appear anywhere but it seems to be.
My first encounter was just randomly walking around and finding a place where you're supposed to fight a dragon, the other two was just random.
Also I wish I didn't put points onto Heavy Armour, I got the Dark Brotherhood Armour and obviously it's light ): I'm only level 8 so I guess I haven't fucked up too bad.
EDIT: God dammit, another Dragon. I'M NOT READY!
It seems high cliffs are a good way to encounter Dragons, lol.