I know this is old news.
But I was going through some old photos lately of a trip my first wife and I took to Great Britain back in 1989.
One of the places we visited was the city of Bath.
The Romans established baths here (hence the name);
"During the Roman occupation of Britain, and possibly on the instructions of Emperor Claudius, engineers drove oak piles into the mud to provide a stable foundation and surrounded the spring with an irregular stone chamber lined with lead."
Our plumbing infrastructure is what? ...70, 80 years old? And it's already crumbling. But toga wearing, Zeus worshipping, sandle wearing, mostly homosexual (not that there's anything wrong with that), militaristic, Roman conquerors built a plumbing system in a conquered nation two thousand years ago just to give themselves warm mineral baths between battles and their shit is STILL WORKING!
What did we used to know that we unlearned?