In the location's words:

It goes without saying that people in Cologne drink and brew Kölsch. But Cologne and wine? As part of the Museum Night, visitors to the Wine Museum will not only learn that Cologne was the most important wine city north of the Alps in the Middle Ages, but also many other historical features on the subject of Cologne and wine. In addition, they can stroll through the beautifully illuminated vineyard: After all, the 700 or so vines of Cologne's "vineyard" shine in impressive light only on this special night.