Spatial Cultural-Historical Units of Great Importance (Serbian: Просторне културно-историjске целине од великог значаjа/Prostorne kulturno-istorijske celine od velikog značaja) are the monuments in Serbia that have the second level of the State protection.
Those are part of the Cultural Property of Great Importance protection list.
References
Spatial Cultural-Historical Units of Great Importance (Serbia) Wikipedia(Text) CC BY-SA