Discuss the evolution of structural engineering principles from ancient civilizations to modern times, considering the advancements in materials, construction techniques, and design philosophies. Analyze how factors such as environmental sustainability, resilience to natural disasters, and socio$-$economic considerations have influenced the development of civil engineering practices. In your response, provide detailed examples of iconic structures from different historical periods and regions, highlighting their engineering significance and lasting impact on the built environment. Additionally, explore the role of interdisciplinary collaboration and technological innovation in shaping the future of civil engineering, addressing challenges such as urbanization, infrastructure renewal, and global connectivity. Finally, reflect on the ethical responsibilities of civil engineers in promoting safety, equity, and long$-$term viability in the design and implementation of infrastructure projects, considering the potential consequences of their decisions on society and the environment.