> Bridges and buildings from the 1970s (and much older) are still working fine today. With modern earthquake straps added, and I bet the locks got replaced a f

> Bridges and buildings from the 1970s (and much older) are still working fine today. With modern earthquake straps added, and I bet the locks got replaced a few times over, also the building likely had its insulation improved, better venting added, a sprinkler system, fire exits, and a wheelchair ramp put in at some point. Are there a few quaint stone bridges from 1700 still in use? Sure, going over the neighborhood creek. But all the bridges around me have undergone serious upgrades or retrofitting over the decades.