Magic tree house, #36. A Merlin mission. The magic tree house carries Jack and Annie to New York City in 1938 on a mission to rescue the last unicorn.

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

Super Rabbit Boy gained his superpowers when, as a baby, he ate the magic carrot he found in the Wise Woods; now King Viking has built a time machine in order to team up with his younger self, Prince Viking, and prevent Baby Rabbit Boy from finding that carrot--so Super Rabbit Boy has to go back in time, and with help from an unexpected player, save his younger self and protect the timeline.

The magic treehouse whisks Jack and Annie back to the days of deserted islands, secret maps, hidden gold, and nasty pirates.

Jack and his younger sister take a trip in their tree house back to ancient Egypt, where they help a queen's mummy continue her voyage to the Next Life.

Magic tree house series, #23. When Jack and Annie travel back to the Kansas prairie in search of "something to learn," they gain an understanding of how hard life was for pioneers and they experience the terror of a tornado.

Greedy Llama travels back in time to eat his marvelous birthday donut a second time, but a Baby Llama follows him to the present, and soon his house is a chaos of cave llamas, barbarian bunnies, and Viking pigs.

Jack and Annie ride a tree house to the Amazon rain forest where they encounter flesh-eating piranhas, hungry crocodiles, and wild jaguars.

Thanks to Dr. Bunsen's latest wacky invention, Gabriel, Laura, and Caesar are blasted back to the prehistoric era, where they find themselves dashing from flying pterosaurs, stomping stegosaurus stampedes, and a sharp-toothed T-rex.

Jack and Annie travel in their magic tree house to Elizabethan London, where they become actors in a production of A Midsummer Night's Dream and try to rescue a tame bear.