Interestingly you can still easily find the Barcelona building where Gemma was involved in his last fight in The Return of Ringo.
If you copy a link to a web browser the current building “Can Sentmenat” can be seen. If you combine https://www.google.se/ with the rest of the link below it should work.
The bulding matches well with Can Hospital here on Yoshi Yasuda’s very useful web site :
It can’t be very far from the nowadays nonexistent Barcelona western town Esplugas City which also was a location in The Return of Ringo.