The following links provide a variety of resources on place-based education ranging from brief overviews to more in-depth articles as well as some specific examples of place-based programs in action.
The Montana Heritage Project is a place-based initiative which aims to make Montana students experts in their state's history, culture and economy by local resources as tools for learning.
Two Edutopia articles which discuss the basics of using place as a starting point for education and how the Walden Project does that specifically.
Outside In: The Walden Project Helps Students See the Forest for the Trees