https://www.smithsonianmag.com/travel/explore-romes-hidden-underworld-city-beneath-city-180986228/
A forgotten aspect of visiting Rome
Fascinating article, Dave. When I went underground below St. Peter's Basilica in Rome, I discovered much of the same "lost" Roman civilization as highlighted here.
It is fascinating and I wish I could go back there again for another look
I'll be doing it this December.
Ooooo lucky :)
In the meantime, for those who would like to explore these things from the comfort of their armchairs, Auntie made a documentary, Rome's Invisible City, some years ago that used a whole load of 3D laser scanning to recreate what is underground. For a taster, have a look here (https://scanlabprojects.co.uk/work/romes-invisible-city/).
8)
Looks visible to me.... :P