According to Wikipedia a book town is a town or village with a large number of second-hand or antiquarian book shops. These shops, and sometimes also literary festivals, attract bibliophile tourists to them. A number of the book towns are organised in the International Organisation of Book Towns.
You can see a list of book towns HERE.
Urueña in the province of Valladolid, Castile and León, Spain is member of the International Organisation of Book Towns. For additional information click HERE.