Where does the anime take place? Does anyone know what city or country the anime Gungrave takes place in? 
I viewed the wiki and read a couple of forums and could not find an answer. 

I know it's mafia-based but the anime shows a town similar to how Roanapur is portrayed in Black Lagoon as a lawless Thai city.
The anime Gungrave was made off a game from what I can tell, it doesn't have much thought into its original setting or a place.

Based off of how the anime is set up, I'd anticipate 70's or 80's era in some part of Japan or Italy, but there isn't a real answer to this.