While in England I visited the Ely Cathedral which has a stained glass museum, which traces the history from when stained glass was first used up to the present.

The cathedral is impressive and the stained glass is amazing. The group I was in was made up of embroiderers so they gave us a special display of the cathredral's pieces, but we were also allowed to wander as we wished. Here is my blog entry, with a lot of the windows in the cathedral: http://woodswell.com/wp/2019/12/08/monday-16-september-esp-ely-cathedral-and-oxford/