Hi Martha,
The cradle (and place of "invention" if you want) of cava is, precisely, here in Catalonia :) Read about it here: https://www.cava.wine/en/regulatory-board/cava-designation-of-origin/cava-history/
Here you have a handy map of the different wine regions here in Catalonia: https://cmsmultimedia.catalunya.com/mds/multimedia/485902/ and here is a more detailed doc which includes lots of info: https://cmsmultimedia.catalunya.com/mds/multimedia/485878/
Catalonia is home to some of the best wines in the world. Wine and food define our culture and folklore. Priorat, Penedes, Cava, and much more. The Greek colonies in the Emporda region introduced the cultivation of vines probably over 2000 years ago. Later, the Romans centralized the production around Tarraco (Tarragona) and Alella, near Barcino (Barcelona). During the medieval ages, monasteries developed and improved the varieties, such as in the case of Priorat. The Catalan wine industry nowadays produces ~380 million bottles per year.
For info, the grapes used In Catalan wine are classified as follows:
- Native Catalan Grape Varieties: Macabeu (aka Macabeo, or Viura in Rioja region), Xarel·lo (aka Pansa blanca in Alella), Picapoll, Sumoll (Red), Trepat (Red)
- Traditional Catalan Grapes: Garnatxa (aka Garnacha or Grenache), Malvasia, Monestrell, Moscatell, Parellada, Samsó, Ull de llebre (aka Tempranillo)
- In addition to the native and traditional grape varieties, Catalan wineries also produce international modern varieties such as: Cabernet Sauvignon, Pinor Noir, Syrah, Merlot, Riesling, Chardonnay, Sauvignon Blanc and Cabernet Franc
The offer of wine tours is large, in Catalonia -a territory the size of Maryland- there are more than 600 wine producers. Nowadays, many of them offer visits and tastings in their wineries, as well as complementing the offer with excellent meals. The problem for the foreign visitor is that many of them are out of reach because it is not always easy (or convenient) to use public transport to get to them. Therefore it is best to rent a car.
Not being my area of expertise, I advise you to visit the Tourist Office in Barcelona for more and better information.
Enjoy!