The pantheon's latitude isn't that far north, but Rome's borders stretched pretty far. Hadrian's wall is well into the uninhabited part of Canada. But I don't actually know if they used the same methods throughout the empire. And for that matter, latitudes aren't directly the same as temperatures.
I wonder if limestone in the concrete would withstand months and months and months and months of cold temperatures. Asking for everyone in Canada.
I'm constantly surprised how far north Europe is
https://matadornetwork.com/read/mapped-united-states-canada-latitudes-europe/
The pantheon's latitude isn't that far north, but Rome's borders stretched pretty far. Hadrian's wall is well into the uninhabited part of Canada. But I don't actually know if they used the same methods throughout the empire. And for that matter, latitudes aren't directly the same as temperatures.