If you would like to learn about Swiss wine, do some tastings, walk through the vineyards, have a light meal, or purchase some bottles, this is a great place. It is in a new ultra modern building at the base of the vineyards just east of Sion. It is a joint venture of two of the largest makers in the upper Rhone Valley, Varone and Bonvin.
Although access is generally by automobile, it can be reached from Sion rail station by the #14 bus to Sion Funeraire, then a 7 minute walk through the vineyards.
https://celliers.ch/
The website is all in French, so let Google Translate handle it.