Usine à Gaz is Nyon's main contemporary cultural venue, set in a former industrial building near the lakefront. The programme leans toward concerts, theatre, comedy, dance, and experimental performance rather than museum-style sightseeing.
It is worth checking if you are in Nyon overnight or using the town as a quieter Lake Geneva base. A ticket here gives the evening a local shape, away from the postcard rhythm of castle, promenade, and lake views.