Berlin uses a different system in the older parts of the city

https://googlemapsmania.blogspot.com/2016/04/the-berlin-hous...

Wikipedia describes two systems in the UK: https://en.wikipedia.org/wiki/House_numbering#United_Kingdom

According to both those systems, if you look down the street from the end where number 1 is (which is always the open end of a cul-de-sac), then number 1 is the first house on your left. I'd be interested to hear about any exceptional cases in which number one is on your right.

I don't know of any country that uses an entirely different system, but I'm willing to bet each country has a couple of exceptions somewhere.

related maybe? https://en.wikipedia.org/wiki/Belphegor%27s_prime

Obligatory: https://www.mjt.me.uk/posts/falsehoods-programmers-believe-a...