Using their magic tree house, Jack and Annie travel back to the time of the American Revolution and help General George Washington during his famous crossing of the Delaware River.
"The magic tree house whisks Jack and Annie away to Greenland where they discover they've traveled back in time to meet Lief Erikson"--Provided by publisher.
Jack and Annie continue to try helping Merlin the magician by searching for the secrets of happiness, and their magic tree house takes them to Antarctica, a wasteland where the penguins may know what to do.
Children and their robot friend build a treehouse in a [song] that fits the tune of "London Bridge is Falling Down." Includes facts about simple machines, jobs robots do, an activity, and musical notation.
"When Mip and Pip agree to a contest to see who can build the tallest tree house by sundown, Mip seems to be winning until a storm blows through the forest"--OCLC.
While Will has exciting adventures with aliens, mummies, and more, his little sister, Flora, captures them in pictures to hang in her treehouse, making them even better than Will imagined.
