I highly recommend all of these if you like fantasy!
The Fablehaven series! By Brandon Mull
It's about a fantasy creature reservoir.
And not sure if theres an english version cause I read them in spanish but I also liked a lot La Emperatriz de los Étereos (The Empress of the Ethereal) about a society living in caves and a kid wanting to explore the outside, and Memorias de Idhún (The Idhun Chronicles) kids get taken to another world with unicorns, dragons, gods and stuff. Both from Laura Gallego.