There are a number of structures that are clearly connected to a country or city, symbols of them known around the world. The Eiffel Tower in Paris, Tower Bridge in London, the US Capital in DC, The Sydney Opera House, The Empire State and Chrysler buildings in NYC, The Leaning Tower of Pisa, Brandenburg Gate in Berlin, all of which I have seen or been in. Then there are the pyramids of Egypt or certain areas of Mexico, major symbols of their countries. There are cities who's designs are symbols, like Amsterdam and Venice with their canals, great cathedrals or other religious structures like the statue of Jesus on top of a rock overlooking Rio in Brazil. They and others like them are the great combination of structural engineering, design, architecture, local culture and they become iconic.
Sadly some of these structure are symbols to some of evil. The original WTC towers became such symbols of the USA and 'the West' they were destroyed 18 years ago in an obscene act of terrorism. Some structures like the Eiffel tower have become far less accessible to the public over the years as need to be protected from acts of terrorism.
Since the 1960's there has been the movements around the world to save and preserve important and historic structures. The loss of some great structures, like the original above ground part of Pennsylvania Station in NYC and others led to preserve and eventually restore others like Grand Central Station in NYC. Sometimes great form follows function. the need to cram more usable space from a small urban plot of land led to the skyscrapers, canals and train stations for movement of people and goods, the pyramid of the Louve in Paris, improving access to it by the public without major changes to its almost 200 year old structure. Such structures are parts of our lives and should be celebrated for how they contribute.