The program has been popular among private forest owners because of its bottom-up approach and because the program is a voluntary commitment. The Finnish World Heritage sites include e.g. the Fortress of Suomenlinna in Helsinki, wooden town in Old Rauma, Petajavesi Old Church, The Verla Groundwood and Board Mill and Kvarken Archipelago. Thus, the degree of restrictions to human use varies depending on the type of protection and it can vary among different sites.