Time travel 
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Author:
Series:
Magic tree house. Merlin missions volume 1.
Average Rating:
4.8 stars
Description:
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.
Author:
Series:
Geronimo Stilton. Journey through time volume 6.
Average Rating:
4.6 stars
Description:
When, in the process of testing his newest time machine, Professor von Volt accidently brings a triceratops, Helen of Troy, Attila the Hun, Charlemagne, and Christopher Columbus to present day New Mouse City, it is up to Geronimo and his friends to return them all to their own times and places--without being eaten by a T-Rex or skewered by Trojan warriors.