, perhaps an inch or a couple centimeters every century.
Thats only about a 15” or so, then, in 1500yrs. Certainly not 20’. It is also noted that the Pantheon remains at its ancient level.
I thought he kinda missed the mark on this one.
That might be because it probably was built on a rock foundation. Where I live in Middle Tennessee, a lot of land you can find rock about a foot or two below the ground level. It is rare to find houses with basements in them unless they are built on those rare to find spots where you can dig deep enough for a basement with out finding rock.
The Pantheon has been in continuous use, first as a Roman temple (built in the time of Hadrian on the site of Agrippa’s), so, not the same thing.