Córdoba is a city in the southern Spanish province of Andalucía. It was an important Roman city and a very large Islamic cultural center in the Middle Ages. It’s best known for La Mezquita, or the Mosque-Cathedral, an immense building dating to 600 AD featuring a columned prayer hall surrounding a 1600s Catholic cathedral that now occupies the center of the mosque. Córdoba is also home to the Roman Bridge (reconstructed several times since Roman days) across the Guadalquivir River, and the Alcázar (Castle) of the Christian Monarchs (originally built by the Moors and expanded in the 14th century).