Erected in 1401 on a long-time site of worship, the Cathedral is one of Europes most impressive buildings. When the canons demanded a new church such and so well that it should have no equal, construction was started in a style that is an architectural collage: primarily Gothic with elements of Visigothic and Almohade (Moorish) art. The text traces the Cathedrals history from a 12th century mosque to its blessings in 1507. In addition, a tour of this magnificent structure is conducted with emphasis on its unusual architectural features.