The collapse of the Roman world left sprawling urban centers which, despite their utility, were largely abandoned or stripped for their raw materials. The beauty and utility of something is usually outpaced by the economic requirements of maintence and operation. In the wake of collapse, there is considerably less wealth available to the emerging populations than was when the urban centers were built. Repurposing the raw material or abandoning the cities to meet the pressing needs of the time took precedence and will always take precedence. So it will be with our cities, monuments and technologies.
When I am dead, my body will be stripped for its raw materials by fungi, bacteria, worms and potentially wildlife if unearthed to be repurposed by those organisms into energy to do whatever work they must do. A far distant relative may stumble upon my bones and fashion ornaments or weapons of war even with little regard for their former constitution.