Externally, the cathedral was built as a fortress, to provide security due to the continuous wars that the city suffered. Its construction began after the conquest of Badajoz by King Alfonso IX during the 13th century. The building is crowned with battlements and has a tall quadrangular tower with large windows in its second section. It has three entrance gates, the main one being that of San Juan Bautista, crowned by the image of the saint. The interior has a basilica floor plan with three naves featuring five bays, a transept and a chancel with three apses. Decadent Gothic vaulted ceiling.