The impact of the Great Fire of London in 1666 was profound, leading to major changes in urban planning, architecture, and fire safety regulations. The fire, which destroyed a large part of the city, including St. Paul's Cathedral, prompted a massive rebuilding effort with new construction standards and materials, including the use of brick and stone instead of wood. The disaster also led to improved fire-fighting strategies and the establishment of a more organized city government. Socially, the fire displaced thousands but also fostered a sense of resilience and community among Londoners as they rebuilt their city.