This lecture covers the fundamental principles of bridge design, focusing on quality, stability, durability, function, and resistance. It also explores case studies such as the Pont du Gard and the Salginatobel Bridge, highlighting their architectural significance and impact on engineering. The instructor discusses the influence of bridges on traffic, sustainable development, and economic factors, emphasizing the importance of compatibility and speed of construction. The presentation delves into the work of renowned engineer Robert Maillart and his innovative approaches to bridge construction, showcasing the blend of art and engineering in iconic structures.