Why is it so hard to build a structure to last forever?

Building a structure to last forever is challenging due to various factors, including environmental wear, natural disasters, and material degradation over time. Even the most durable materials can succumb to erosion, corrosion, and structural fatigue. Additionally, human activities, climate change, and unforeseen events can accelerate deterioration. Finally, the concept of "forever" is complicated by changing needs, technologies, and societal values that may render a structure obsolete or impractical.