Córdoba is a city in the southern Spanish region of Andalusia, and the capital of the province of Córdoba. It was an important Roman city and a major Islamic center in the Middle Ages. It’s best known for La Mezquita, an immense mosque dating from 784 A.D., featuring a columned prayer hall and older Byzantine mosaics. After it became a Catholic church in 1236, a Renaissance-style nave was added in the 17th century.