The Sydney Opera House stands as one of the most significant architectural achievements of the 20th century, not only for its striking visual identity but for how radically it redefined architectural possibility. Designed by Danish architect Jørn Utzon, its sculptural sail-like shells broke away from rigid modernist forms, embracing expressive geometry inspired by nature and maritime culture. The building pioneered innovative engineering solutions, particularly in the development of its precast concrete shell system, which resolved unprecedented structural challenges and influenced future large-scale architectural design. Beyond its technical feats, the Opera House transformed the role of architecture in the public imagination, proving that civic buildings could function as monumental artworks deeply integrated with their cultural and geographic context, ultimately becoming a global symbol of creative ambition and national identity.