Outdoor education is gaining popularity in many countries. In Denmark and Scotland, regular school lessons are increasingly taking place outside the classroom. The newer educational plans in the federal states of Germany also increasingly call for teaching outside the classroom. However, conceptual approaches—especially in the secondary school sector—are still relatively rare in the field of outdoor education in Germany. This anthology presents various approaches to outdoor education and primarily offers valuable insights, suggestions, and contacts for teachers, as well as interested researchers and parents, for lessons outside the classroom. Over 30 outdoor-experienced authors provide insights into outdoor education both domestically and abroad, bridging the gap between research and teaching.