Lecture 1. What is a cathedral? — Lecture 2. Early Christian architecture—Lecture 3. Romanesque: a new monumental style—Lecture 4. Vaulting: a look at roofs—Lecture 5. Romanesque at its best—Lecture 6. Saint-Denis and the beginning of Gothic style—Lecture 7. The urban context of cathedrals—Lecture 8. Notre Dame in Paris—Lecture 9. Early Gothic style: Laon—Lecture 10. Chartres: the building—Lecture 11. Chartres: the sculpture—Lecture 12. Chartres: the windows—Lecture 13. Amiens: the limits of height—Lecture 14. Amiens: the façade—Lecture 15. Reims: the royal cathedral—Lecture 16. Cathedrals: who builds? who pays? how long? — Lecture 17. New developements in Gothic France—Lecture 18. Late Gothic churches in France—Lecture 19. Early Gothic architecture in England—Lecture 20. Decorated and perpendicular English Gothic—Lecture 21. Gothic churches in the Holy Roman Empire—Lecture 22. Gothic churches in Italy—Lecture 23. Gothic styles in Iberia and the New World—Lecture 24. Gothic architecture in today's world.