It’s a while since I watched ‘Pistol for Ringo’, but I’d guess that such a major interior setting would be done in a film studio - I’ll have to watch again soon.
Spotting the locations is a big part of the fun for me … like in ‘Fistful of Dynamite’ when Juan and family arrive at ‘Mesa Verde’ The railway station is in Almeria city, and Juan’s view is the cathedral in Guadix, about 70 miles northwest.
It’s even better when someone is shooting from a Roman location and hits their target in Madrid or Almeria … now that’s real marksmanship !!!