The town of Traben-Trarbach on the River Mosel set up their Christmas markets in the former wine cellars. “When it‘s really cold outside and it‘s snowing, we whisk you off to the pleasantly warm and romantically lit large former wine cellars of our town: as soon as you walk into one of the cellars, some of which date back to the 16th century, you can smell the comforting warm aroma of mulled wine, roasted almonds and fir sprigs. “https://www.traben-trarbach.de/en/underworld-christmas-market.html
It was certainly warm and unique.