Name a few great fantasy book series.
Any list of great fantasy series is sure to include the Lord of the Rings.  Written in the mid 20th century by J.R.R Tolkien, the story centers on Frodo Baggins, a young hobbit tasked with the impossible task of carrying and ultimately destroying the One Ring, which was forged by Sauron as a means to claim complete dominion over all of Middle-earth.   In his quest, Frodo is aided by three hobbits, a human ranger, a dwarf, an elf and a wizard.  Together this band of friends and heroes battle orcs, trolls, wargs, giant spider and a host of dark creatures in their quest to save Middle-earth.  

Another epic fantasy series is the Wheel of Time by Robert Jordan. Told over 14 volumes, this tale is set in a high fantasy world where magic exists, but only some can access it. The series begins with Moraine, a powerful channeler on a quest to find the prophesied "Dragon" who has been reborn with the power to defeat The Dark One. Moraine follows the clues to a small village and to five young men and women, one of whom she is convinced is The Dragon reborn. Throughout the series, these six, along with a coterie of interesting and intricately webbed characters quest throughout the world, fighting the emergence of dark forces and working to discover their own powers and destinies.  

Arguably the most popular fantasy series ever written is Harry Potter by J.K. Rowling. The seven novels in this series follow the story of Harry Potter, a young orphan who discovers on his 11th birthday that he is a wizard. He is welcomed into the prestigious Hogwarts School of Witchcraft and Wizardry where he learns magics, makes wonderful friends and a few enemies. He also learns of and must faced his dark history and connection to Lord Voldemort, one of the most powerful, evil dark wizards who killed Harry's parents and tried to kill Harry when he was just an infant.