There are caves all through the Loire Valley which were originally limestone mines (read more here) and no matter the weather - from minus 20°C to 40°C - the temperature inside is between 12°C and 13°C with a humidity of between 85% and 90%. This is perfect for storing wine as the level temperature allows a steady ageing, and the high humidity ensures the corks don't dry out.
What I wasn't expecting to see was a proper mist inside the cave, I assume caused by how hot and humid it was outside. I am not quite sure what the science of it is, but it really was noticeable.
While I was there I also took a photo of some of the "Old Hoak Barrels" which are used to store the sweeter wines for two years.
Simon
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