Mary Pope Osborne

The magic tree house takes Jack and Annie back in time to feudal Japan where the siblings learn about the ways of the ninja.

The magic tree house carries Jack and Annie to New York City in 1938 on a mission to rescue a magical unicorn from New York City. They arrive during one of the darkest periods in the city's history--the Great Depression. Even worse, the city is in the grip of a terrible snowstorm. Where will Jack and Annie ever find a unicorn in the city? And who are the mysterious people following them? Includes instructions to make a snow globe.

"Jack and Annie search for the fourth secret of greatness for Merlin the Magician in Mexico City at the 1970 World Cup Games. They hope to learn something new from soccer player great, Pele"--

"The magic tree house whisks Jack and Annie back to 1621 on the very first Thanksgiving Day. The Pilgrims ask them to help get things ready. But whether it's cooking or clamming, Jack and Annie don't know how to do anything the Pilgrim way. It's time for giving thanks, but will they ruin the holiday forever? Or will the feast go on?" --

Jack and Annie are transported by their magic tree house to the time of the Civil War where they meet Clara Barton.

Jack and Annie visit the Paris World's Fair of 1889 in an effort to protect four scientific pioneers from an evil sorcerer.

Having used their magic tree house to travel to India, where they must get a gift to help free the dog Teddy from a spell, Jack and Annie have adventures involving a tiger and other endangered jungle animals.

"The magic tree house takes Jack and his sister Annie to the Great Plains where they learn about the life of the Lakota Indians."--

Guided by a magic rhyme, Jack and Annie travel to ancient Baghdad on a mission to help the Caliph disseminate wisdom to the world.

When Merlin is weighed down by sorrows, Jack and Annie travel back to feudal Japan to learn one of the four secrets of happiness.