(I did a quick search and didn't find anything so I hope that this hasn't been done before)
I stumbled across this
dialect quiz that produces a map reflecting dialect and pronunciation similarities in the US. Here's mine:
It's fairly accurate in my opinion! I seem to have the most in common with my native Northern California, and I would apparently have a hard time in Louisiana (and Western Penn for some reason? I had no idea that region even had a unique accent!)
I think it could be fun or interesting to compare maps (even if you're not from the US, for ****s and giggles). The quiz itself is also interesting, as it gives you individual maps corresponding to the answer you last gave as you go along. There are words and phrases featured as answers that I have never ever heard of either.