The mosque-cathedral, with its extraordinary mihrab, is without doubt a masterpiece of Muslim art. Construction was started in 780, on the site of the Visigothic church of St-Vincent. A series of new naves was subsequently added until 987, when it acquired its current dimensions. After the Reconquest, it was transformed into a place of Christian worship, and in the 16C a Gothic cathedral was erected inside the forest of columns, in so doing creating one of the most unique buildings in the world.