My Favorite Book
"The Lord of the Rings" trilogy by J.R.R. Tolkien
I've loved these books (along with "The Hobbit") since I was a child. The world that Tolkien created was so complete and detailed, including multiple complete languages, it seems real.
"The Lord of the Rings" movie trilogy by Peter Jackson was very well done and fun to watch, but "The Hobbit" trilogy was a bloated mess.