3LHD is working with the City of Karlovac on a "Fresh water aquarium center - Kaquarium". On an abandoned Korana river campsite all the facilities are located around one point - the square, and do not disturb the natural look of the river valley. The complex consists of tourist, sports and recreational facilities with congress and education spaces, entrance building, offices and the exhibition which is a display of the flora and fauna of the Croatian rivers - it shows a "typical" karst river.