For those saying "they're all over the world", it's not clear from the article but there's literally wind flowing from inside the mountain and that's flowing all year around at ~10°C, even during summer when it's 35C outside. I live in a valley nearby, but in Italy, we have them too. I'm not aware of similar places elsewhere, at least not at the scale we have them here (every little town has their own place where they found the cool air flowing out). Built centuries ago, they're still used to store wine by the old people in town. Sometimes I go there to cool down in summer. Very different from a cellar.