ShotHotspot has mapped 20 abandoned places in Visoko, Varazdin, ranked by how often they're photographed, viewed and voted for. The most popular are Brick Factory, Paromlin and Bubara Akc Medika. Some are private property or unsafe, so get permission before you visit.
We don't know whether you're allowed to visit any of these places. Many are private property, closed to the public or unsafe: get permission from the owner or the relevant authority, and take safety precautions.