It was the heart of winter below the equator, so the vines are sleeping. You can see the Andes in the background - they rise up over the city very dramatically.  When the grapes are harvested, they are placed in fermenting columns and raised or lowered to the right temperature, depending on the type of grape.

After the grapes are done the initial processing, the juice is moved to oak casks, which are placed in tunnels that maintain the exact temperature for that kind of wine. Sorry about the drops on the lens, it was a drizzly day.