Kotor

Went to Montenegro for a day-trip, the border is only 45 min away from Dubrovnik.

This is the mountain behind the old town of Kotor, a beautiful medieval town hidden at the back of a fjord. Old defense walls that you can still climb (press 'L' to see the climbers!).
The whole site is classified as a Unesco World Heritage.
And it deserves it! One of the most beautiful places I've been to.