Cool underground cave-like dwellings visible from the highway as you pass through the Lachin corridor are pretty impressive.  At border control with Nagorno-Karabakh if you drive through (the customs station is at the bottom of a hill around a bend across a small river) quickly in an Armenian plated car, noone bothers to ask for your visa papers or anything - I had a visa waiting for me there, but my driver sped through and just ignored them with no consequence.  The police chief in Stepanakert said I did not need it once I was there, so...