Inside the Cathedral of Burgos, visitors can not miss out the unbelievable dome dates in the 16 century; in the central nave is the main altarpiece (16th century) which is considered to be one of the best altarpiece in Spain; the beautiful choir; the golden staircase from 16th century; the famous Papamoscas from 16th century (a strange figure doll on a clock that opens its mouth once a hour); the tomb of Rodrigo Díaz de Vivar, known as El Cid Campeador (1044-1099) and his wife Jimena; the Flamboyant Gothic Condestable chapel which is a masterpiece by Simon de Colonia (1450-1511) from the 15th century and its stained glass window; the Saint Tecla chapel (18th century), and many more artworks.