The remarkable alternative school form of the Danish folk high schools has endured in Denmark for 150 years. The history of the Danish folk high schools provides a valuable exemplar of a successful grass roots movement in adult education. This paper aims to trace the historical as well as academic backgrounds of the emergence of the Danish folk high schools and to explore how the distinctive school system works in the context of the post-modern industrial society. In order to reveal the reality of the school system, updated literature from recent publications and data from an interview of a Danish folk high school principal are incorporated into this paper. The author concludes that the ideas of schools for life and free education are conducive not only to the development of popular or adult education, but also complementary to the practice of structured pedagogy in primary and secondary schooling.