The Cathedral was built on top of a Romanesque church and was not finished until the 18th century, when its two towers were completed.
Its structure is late Gothic with some Baroque and Plateresque elements, such as the main entrance and two of its towers. The main altarpiece is octagonal, a solution by its architect, Gaspar Becerra, to adapt it to the shape of the apse. The main entrance is in the flamboyant Gothic style and is exceptionally beautiful, abundantly decorated with plants and cherubs. The doors of the vestry are by Gil de Hontañón. Of particular interest is the walnut-wood pulpit with bas-relief attributed to the master Becerra. There are sculptures of great value such as an Inmaculada by Gregorio Fernández on the interior. The Diocesan Museum is located in a room off the cloister.