Eight-year-old Jack and his younger sister Annie find a magic tree house, which whisks them back to an ancient time zone where they see live dinosaurs.

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

"A group of time-traveling teens races through history to try to stop time and the multiverse from unraveling"--

When Joe travels back in time to 1944, he meets the Milwaukee Chicks, one of the only all-female professional baseball teams in the history of the game.

Sixteen-year-old Gwen, the newest and final member of the secret time-traveling Circle of Twelve, searches through history for the other time-travelers, aided by friend Lesley, James the ghost, Xemerius the gargoyle demon, and Gideon, the Diamond, whose fate seems bound with hers.

On Christmas Eve, Jack and Annie's tree house transports them to King Arthur's castle at Camelot, where they undertake a quest to the castle of the Otherworld.

The fifteen-year-old Murry twins, Sandy and Dennys, are accidentally sent back to a strange Biblical time period, in which mythical beasts roam the desert and a man named Noah is building a boat in preparation for a great flood.

"Seventeen-year-old Ana̐s just wants tonight to end. As an outsider at the kingdom's glittering anniversary ball, she has no desire to rub shoulders with the nation's most eligible (and pompous) bachelors--especially not the notoriously roguish Prince Leo. But at the stroke of midnight, an explosion rips through the palace, killing everyone in its path. Including her. The last thing Ana̐s sees is fire, smoke, chaos . . . and then she wakes up in...

Owen is trapped in a time travel plot-your-own-adventure book, controlled by the reader, and a bizarre fellow prisoner, Kara Dox, might be his only hope for escaping to save Bethany.

The magic tree house takes Jack and Annie to San Francisco in 1906, in time for them to experience one of the biggest earthquakes the United States had ever known.