The Magic Tree House series by Mary Pope Osborne is a set of books that follow a young girl and her older brother as they travel through time and space via a magical tree house. The series combines elements of fantasy and adventure, with themes centered around trees, houses, and the concept of "popes" (although the use of this term is likely metaphorical). With the books written in English, readers can immerse themselves in a world of magical journeys and educational lessons about history and science.