Why are ancient buildings still standing 1500+ years later, but some buildings built like 30 years ago are falling apart?
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The buildings that are still standing from a millennia ago were all built of stone. Even of stone buildings, only a very small fraction of a percent have survived.
Most small buildings today are built of wood and drywall, then surrounded by plastic. The only cement or steel they are likely to have is in the foundation. Those materials don’t stay together as long without maintenance (though they should last 30+ years if well-constructed).
Skyscrapers and giant factories can stand unattended for decades or longer because they’re made mostly out of cement and steel.
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