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

Their magic tree house takes Jack and Annie back to retrieve a lost story in ancient Greece, where they witness the original Olympic games and are surprised to find what girls of the time were not allowed to do.

Eight-year-old Jack and his younger sister Annie use the magic treehouse to travel back to the Middle Ages, where they explore a castle and are helped by a mysterious knight.

"Jack and Annie travel back in time to 1925 Nome, Alaska, where they meet Balto, the famous sled dog, and help save the town from illness"-- Provided by publisher.

Regan Fitz and Elliot Mason have been enemies since they started training to become Glitchers--people who travel through time to preserve important historical events. But everything changes when they find a letter from Regan's future self, warning them about an impending disaster that threatens them and everyone they know. Will they be able to set aside their past in order to save the future?--Amazon.com

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

The magic tree house transports Jack and Annie on a mission to the Ice Age where they encounter Cro-Magnons, cave bears, sabertooth tigers, and woolly mammoths.

So far the AstroNuts have failed to find a suitable planet, but NNASA has come up with a new plan: send the four animal astronauts back through time on Earth where they are to contact early homo sapiens and somehow set them on a path to a sustainable future--trouble is, humans seem inferior to many of the other species (especially the wolves), so the AstroNuts come up with a Survival of the Fittest Olympics, hoping that with a little help the humans...