This time, meet famous explorer Leif Erikson and help save a narwhal! When the magic tree house whisks Jack and Annie to Greenland, they're not sure what time they've landed in, but they immediately know what their mission is: save a narwhal! Then, they meet a young hunter named Leif Erikson, and they ask for his help. But Leif has other ideas.

"Jack and Annie are whisked back in time by the magic tree house to meet Benjamin Franklin in Old Philadelphia"--

"Jack and Annie use the magic tree house to travel back in time to 1947 Brooklyn, New York, where they pretend to be batboys at Jackie Robinson's first game with the Brooklyn Dodgers against the Boston Braves"--

Jack and Annie travel back to nineteenth-century Ireland to inspire a young Augusta Gregory to share her love of Irish legends and folktales with the world.

Who wouldn't want to live in a treehouse? Especially a 13-story treehouse that has a bowling alley, a see-through swimming pool, a tank full of sharks, a library full of comics, a secret underground laboratory, a games room, self-making beds, vines you can swing on, a vegetable vaporiser and a marshmallow machine that follows you around and automatically shoots your favorite flavored marshmallows into your mouth whenever it discerns you're hungry....

Eve of the emperor penguin: The magic tree house takes Jack and Annie to Antarctica to search for the fourth secret of happiness for Merlin. Moonlight on the magic flute: Jack and Annie travel to Vienna, Austria, in 1762 where they meet the young Wolfgang Amadeus Mozart and his sister and help save the budding genius' life.

Merlin the magician will not eat or sleep or speak to anyone. The enchantress Morgan asks young Jack and Annie of Frog Creek, Pennsylvania for help. Jack and Annie know they have to search for one of the four secrets of happiness to help Merlin the magician find joy in his life again. And so they head off in the magic tree house for Florence, Italy, in the early 1500s, then to a misty island in the middle of nowhere, then to the continent of Antarctica....

Carnival at candlelight: While on a mission to prove to Merlin that they can use magic wisely, Jack and Annie travel to seventeenth-century Venice, Italy. Season of the sandstorms: Jack and Annie travel back in time to the Middle East and learn how the Bedouin tribe live. Night of the new magicians: Merlin sends Jack and Annie to Paris on a mission to find four magicians.

Join Andy and Terry in their spectacular new 78-storey treehouse. They've added 13 new levels including a drive-thru car wash, a combining machine, a scribbletorium, an ALL-BALL sports stadium, Andyland, Terrytown, a high-security potato chip storage facility and an open-air movie theatre. Well, what are you waiting for? Come on up!

Dragon of the red dawn: When Merlin is weighed down by sorrows, the enchantress Morgan asks Jack and Annie of Frog Creek, Pennsylvania, to use their tree house to travel to a land of fierce samurai and great beauty, in the capital city of Edo (now the city of Tokyo) in old Japan in the 1600s to learn one of the four secrets of happiness. Blizzard of the blue moon: Jack and Annie go back in time to New York City, during one of the darkest periods...