Time-travel is a subject I love reading about in books, so, naturally, I researched some of the books that concern fictional time-travel located at the bookstore where I work. Here are a few of the titles for those of you looking for more time-travel inspired tales.
Young Adult Fiction

Dearest Josephine by Caroline George
While this tale does not deal directly with time-travel as a scientific idea, this book’s “The Lake House” vibes tell a story about the love story of a young woman from 2020 and a young man living in 1820.
Teen Fiction

Waterfall by Lisa T. Bergren
This is the first book in Bergren’s “River of Time” series, where the daughter of a modern-day archeologist finds herself back in 14th-century, war-torn Italy.

The Hourglass Door Trilogy (3 Volumes) by Lisa Mangum
The books contained in this series (The Hourglass Door, The Golden Spiral, and The Forgotten Locket) follow a young woman’s encounter with five Italian time-travelers and the romance she develops with one of them. She literally races against time as she strives to protect him from those who are trying to destroy him and her own life as well. This story is not your typical time-machine story as it involves a door, Leonardo Di Vinci, and a river of time.

Kind of a Big Deal by Shannon Hale
This is not necessarily a time-travel novel but could be classified as such due to the book time-traveling the heroine experiences as she literally fills the shoes of the characters she reads about.

Passage to Zarahemla by Chris Heimerdinger
(This book is followed by a sequel, Escape from Zarahemla) Two runaway orphans flee to a safe haven at the edge of the woods, only to find that it may not be as safe as they thought as they encounter a parallel universe with the past. They soon find themselves among men and women from the time of the Book of Mormon and seek to return home before the lines between present and past become blurred forever.

Tennis Shoes Adventure Series (13 Volumes) by Chris Heimerdinger
Two children find themselves back in the time of the Book of Mormon, where they encounter Nephites, Lamanites, and a whole bundle of dangerous, spiritual, life-changing adventures.
Middle Grade

The World between Blinks by Amie Kaufman and Ryan Graudin
This tale stretches the bounds of time and space as two children find themselves in a realm where lost things are found.
Beginning Reader

Believe and You’re There Series (10 Volumes) by Alice W. Johnson and Allison H. Warner
Follow the adventures of three children as they journey back in time through their grandmother’s mysterious paintings and witness events from the Old Testament, the New Testament, and The Book of Mormon.

The Enchanted Tunnel Series (4 Volumes) by Marianne Monson
Like Johnson and Warner’s series, these books follow the adventures of time-traveling children as they find a passageway at their church building that leads to events in LDS history, including the trek of the pioneers, the miracles of Jesus in Jerusalem, and the exodus of the Israelites from Egypt.

Magic Tree House Series (51 Volumes) by Mary Pope Osborne
While not all the stories in this series deal with time-travel necessarily, a magical tree house takes children to various times and places where they embark on dangerous missions to solve mysteries and return home safely.