At least for this workspace and gallery, which hosts regular exhibitions by Barcelona-based artists. Primarily a studio, Espacio Visible includes a gallery, where both the artists working there and others host regular exhibitions.
View Gallery
View Gallery
View Gallery
If you want to get a feel for what's bubbling up in the Barna underground, Visible is one of the places to go. It's been steadily gaining in popularity, thanks to some interesting exhibitions and workshops that are held there.
Check their website for openings, as this is primarily a workspace with exhibits on the side.