This comprehensive survey traces architectural developments from the early nineteenth century through the mid twentieth, grouping the material into three chronological sections that examine Romantic classicism and Durand’s rational doctrines; Gothic revival, picturesque tendencies, and the advent of iron-and-glass construction; mid-century eclecticism, national schools, and the rise of commercial and domestic building types; and the emergence of Art Nouveau and modernist movements led by architects from several countries. It analyzes technological innovations, shifting stylistic vocabularies, regional variations, and debates between tradition and modernity, while offering plans, illustrations, and critical commentary on major architects and typologies.