We visited wineries in Santiago and the Maipo Valley. Concho y Toro is beautiful but produces mostly jug wines that are available worldwide. The small country winery pictured is in San Alfonso. Its vineyards are visible as one ascends the Andes on an all-day horseback ride. And that’s close enough--the wines are akin to cough syrup.
Vinas Cousino Macul and Santa Ines De Martino, however, are excellent producers and have lovely tours available in English. Due to the times these tours are offered, though, you can't reach both for tours in the same day. I recommend the noon tour at Santa Ines/De Martino, then just going to the tasting room and store at Cousino Macul--or vice-versa. Reservations are required for tours.