Where does the story magic tree house take place?

The "Magic Tree House" book series, written by Mary Pope Osborne, primarily takes place in various locations throughout time and history. The main setting is the magical tree house located in the woods near the fictional town of Frog Creek, Pennsylvania. From this tree house, the main characters, Jack and Annie, travel to different places and time periods, such as ancient Egypt, the Middle Ages, and the American Wild West, through the power of books and magic.