Outdoor Preschool in Norway is by far the most interesting video noting the concept of early childhood learning outdoors.
Learn more about the concept in this Scottish interview of Norwegian Kindergarten.
This less interesting video of a Forest Kindergarten in the UK.
I don't know German, but these two were still fun to watch: Waldkindergarten Bensheim and Waldkindergarten Fuchs und Hase.
And here's kids learning outdoors in Taiwan: Forest Kindergarten Plngtung Taiwan.
Now in the United States, there's the Classroom for These Kids Is Forest.
Cedarsong Nature Preschool near Seattle, WA
Mother Earth School in Portland, OR
For Forest Kindergarteners, Class Is Back to Nature, Rain or Shine The New York Times
German Tots Learn to Answer Call of Nature in The Wall Street Journal
Outdoor Preschool takes root on Vashon Island in The Seattle Times
