Related — this isn't the only map the Romans made that has survived.

https://formaurbis.stanford.edu/

I wonder who would write this type of article without including the images.

https://www.gettyimages.com/photos/baths-of-trajan

I've always wondered how mosaics were made, like, how could they know where to put which stone? Did they prepare a sketch on papyrus first and then put stones to match it? I'm having a lot of difficulty conceptualizing how it could be done.