For the needs of National Park Mljet, and according to the project of the Zagreb architectural office Normala, Černelić Interior Solutions produced and installed in several positions within the park typical houses called “Eko Blok”. Eco block houses made entirely of wood can have various purposes – as ticket and information kiosks as sanitary facilities or other purposes, according to the needs of the user. Eco block houses are energy independent equipped with solar panels and wind turbines for power supply.