CALISTOGA, Calif. (AP) - Things are happening beneath the surface of wine country as caves catch on, a hot spot for storage - and a cool place to hang out.
Winemakers like caves because they provide cool storage without air conditioning and with a natural humidity that reduces evaporation.
Storage is only half the story; today's caves go well beyond wine warehouses, incorporating everything from streams to streamlined kitchens.
The cave wave hasn't been without controversy.
Regulations vary from county to county, but generally the tunneling process must be overseen by state inspectors and then local permits are required for fire safety and whatever use the owner plans for the cave.