Dubrovnik is an amazing walled city on the Dalmatian Coast. Just behind the city is a mountain, and on the other side of it is the country of Serbia. In the early 1990s, Croatia and Serbia were at war, and bombs were frequently lobbed across the mountain and onto Dubrovnik. Much of the city was damaged, but it was beautifully restored.
More recently, Dubrovnik was used as the backdrop for the popular HBO series, Game of Thrones.