Erzurum
Maybe, you had seen a lot in Turkey, so Erzurum could add nothing to that. :)
Sinop
I guess places to the west of this town are even quieter. Amasra is sort of famous there and Zolguldak has some industry (as I remember from some maps), the rest territory of that area is just "empty". I hope to find some Black Sea vibes there, vibes of the old times... I don't know. But it's not about today or tomorrow, I am in Southeast Asia (for 1.5 year) and have no plan to leave yet. :)