If you like Fablehaven by Brandon Mull
If you enjoyed Fablehaven by Brandon Mull, you may want to look the sequel to that book, which is Fablehaven: Rise of the Evening Star by Mull. This book continues the story of Kendra and Seth as they race back to the refuge for mythical and magical creatures in order to protect it from the Society of the Evening Star, an organization trying to infiltrate the preserve and steal a hidden artifact of power.
Some more good books for you are:
Inkheart by Cornelia Funke - It is the story of Twelve-year-old Meggie learns that her father, who repairs and binds books for a living, can "read" fictional characters to life when one of those characters abducts them and tries to force him into service.
Eragon by Christopher Paolini - It tells of a fifteen-year-old boy of unknown lineage called Eragon finds a mysterious stone that weaves his life into an intricate tapestry of destiny, magic, and power, peopled with dragons, elves, and monsters.
The Lion, the Witch and the Wardrobe by C. S. Lewis - This one is probably my favorite of these. It is the story of four English school children who find their way through the back of a wardrobe into a magical world called Narnia. Unfortunately, Narnia is under the spell of the white witch and it is always winter, but never Christmas.