8Mezquita-Catedral, Córdoba

Few places in the world capture the blending of cultures as vividly as Córdoba’s Mosque-Cathedral.

Originally built as a mosque in the 8th century, it later became a Christian cathedral after the Reconquista. Today, it remains a stunning architectural paradox: endless rows of red-and-white arches and Islamic geometric designs coexist with Gothic, Renaissance, and Baroque additions. Walking inside feels like entering two worlds at once—a mesmerizing symbol of Spain’s layered history.