The history of the region is quite rich. The park alone has 5 castles and 32 churches. In Bistrica ob Sotli a big Slovenian-Croatian peasant revolt started in 1573 with the intent to abolish the nobles and start a peasant state. They lost after a long fight and retributions were fierce, 3,000 peasants died in the battle, thousands of captives were hanged or publicly tortured. A special feature of the Slovene landscape are small churches on the top of nearly every hill; beautiful pedestrian routes lead from one to another; Svete Gore is an especially nice to go to. Kozjansko Park successfully combines nature, heritage and culinary traditions.
For the last decade, Kozjansko Park has actively collaborated in many international development projects, and is a partner in numerous European projects.
In the year 2002 the Phare 2000 programme supported the project Forming Sustainable Tourism Products and Services in Kozjansko. The project managed to educate and employ young local intellectuals and started promoting regional products, cultural, and natural heritage.
LIFE Nature is an EU programme that helps to fund the preservation actions for natural habitats and free-living flora and fauna. The project took place over 3 years, to the end of 2003. It brought along numerous improvements in preservation of cultural landscape and habitats in Kozjansko region.
The Interreg IIIA programme's neighbouring programme (Slovenia, Croatia, and Hungary) provided Kozjansko Park the role of partner in a project where they took action to protect the bio-diversity of high-trunk orchards and the aesthetic value of the landscape (2003–2007).
In Transromanica (INTERREG IIIB/CADSES, 2003–2006) the aim was to establish a tourist route connecting important Romanesque monuments from Slovenia through Italy, Austria, and Germany. Located in the park, the Podsreda Castle is one of best preserved Romanesque castles in Slovenia.