The lecture discusses gothic architecture, emerging primarily in France during the 12th to 15th centuries, characterized by features such as pointed arches, ribbed vaults, flying buttresses, and stained glass windows. Initially termed as 'French style', it later acquired the 'gothic' label during the Renaissance, reflecting the negative perception of its aesthetic at that time. Key examples of gothic structures include Notre Dame Cathedral in Paris and St. Patrick's Cathedral in Dublin, showcasing innovations that allowed for taller and more intricate designs.