Why are ancient buildings still standing 1500+ years later, but some buildings built like 30 years ago are falling apart?

Question

Why are ancient buildings still standing 1500+ years later, but some buildings built like 30 years ago are falling apart?

In: Other

Answer 1

It depends where too, places with extreme weather or seismic activity. But older buildings you still see many have been restored and they are made of granite, marble, stone not like modern buildings