Here are some of ours:Quoting Wryan (view post)
DURMITOR (glacier lakes and ice caves, Tara river canyon - 2nd deepest in the world, after Colorado)
SKADAR LAKE (one of the largest bird reserves in Europe, including some of the last Pelicans on the continent)
BIOGRADSKA GORA (54km2 of 500 year old virgin forest and lakes)
This is all within 2-3 hours by car from where I live.