Magic tree house

"Where did the tree house come from? Before Jack and Annie can find out, the mysterious tree house whisks them to the prehistoric past. Now they have to figure out how to get home. Can they do it before dark...or will they become a dinosaur's dinner?."--.

"When the magic tree house returns it whisks Jack and Annie away to the Galapagos Islands where they become World Turtle Experts and must save a tortoise in danger of an erupting volcano"--Provided by publisher.

The magic tree house takes Jack and Annie to an African rainforest, where the siblings encounter gorillas and learn to communicate with them.

"The magic tree house has whisked Jack and Annie to the Himalayas in Nepal. They're searching for the mysterious Gray Ghost...Jack does not want to find a ghost. But he and Annie are excited about all the amazing animals they see. So excited, in fact, that Annie and Jack get lost in the mountains! Can they make their way to safety before the Gray Ghost finds them?"--.