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

survivor bias

most of the buildings built 1500+ years ago are not still standing. there’s a number of buildings we built today that will probably be standing in some form or another in 1500 years