On the subject of "world map of a particular item," there is The Guinness Map, a very accessible map of all the world's pubs that serve Guinness ale on tap: ht

On the subject of "world map of a particular item," there is The Guinness Map, a very accessible map of all the world's pubs that serve Guinness ale on tap: https://news.ycombinator.com/item?id=42406157 https://news.ycombinator.com/item?id=42406157