The concept of forest schools originated in Denmark in 1950. Children who attended Forest Kindergartens emerged with stronger social skills, higher self-esteem, and worked more effectively in group activities. The children were confident and behavioral problems were fewer. It soon became a permanent addition to Denmark’s early childhood curriculum. Not long after Denmark discovered the value of educating children outdoors, Sweden’s “Skogsmulle” concept was developed, a similar educational model that taught children about nature, water, mountains, and ecology. The outcomes were measurable and overwhelmingly positive, making nature and forest schools popular with teachers, children, and parents. The idea soon spread to other areas of Europe.