Survival is based on so many questions. While newer buildings might not be built as solidly as some of the famous older buildings, if preserving them is a goal then they can be obtained.

Likewise, if styles change and they are viewed as unimportant, our methods of destruction would make it easy to destroy them as well.

I would recommend the book "The World Without Us" by Alan Weisman. It imagines a world in which humans are gone and discusses how buildings and cities would deteriorate. While seemingly unlikely that this scenario would occur it's interesting food for thought.

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