Plitvička Lakes - a cool national park.
Petrova Gora - Monument to the Uprising of the People of Kordun and Banija
It is real disrepair, and and I want to see it before it is gone. It was an old Yugoslavian monument to the anti-nazi / anti-fascist resistance fighters in WWII. There are a number of these brutalist style statues and monuments in the old Yugoslavia (now Croatia, Slovenia, Bosnia, Serbia, Montenegro, Macedonia (FYROM) and Kosovo). I have taken pictures of lots of them, but this one is close by where we are traveling and I have never seen it. We should see it soon because the steel is being stripped.
I saw the plans for this in the Yugoslavian show at Moma. It was a museum as well, although abandoned right after the break up of Yugoslavia (1991).