If you're thinking about going wine tasting while in Barcelona - go to Cavas Codorniu! It's only 45…read moremin drive from the main city... and totally worth it.
Their tour that includes a train/trolley ride through the underground caves is so fun, impressive, and all in all, very informative. The grounds of the winery are gorgeous, after the tour we hung out in the garden, where we had lunch and more cava.
All staff was very nice and attentive the guests.
I felt that the pricing of the tour and wine were reasonable - I remember paying $18-20 for a bottle of delicious Cava. Nothing like the Sonoma/Napa prices! Heck, even lunch was fairly priced, plus you get beautiful views of the mountains and the winery.
FYI: there are other wineries to explore in this area. also, the Monserrat monestary was only a 45 minute drive from Cavas Codorniu.