Mezquita de Córdoba

Originally a Roman temple, later a Visigoth church, the site became a shared place of worship when the Moors took Andalusia in 711—an extraordinary act of tolerance for the time. This harmony ended in 784 when Emir Abd al-Rahman ordered the church's demolition to build a grand mosque. Expanded over two centuries by 987, it was the largest in the Islamic world, second only to the Kaaba in Mecca.