Among the church's most famous attractions are its stunning series of stained glass windows. One in particular depicts the gruesome murder of Becket himself. Now, decades after one art historian hypothesised as much, new research has proven that some of the stained glass windows in the cathedral may be among the oldest in the world.
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Source : https://www.bbc.com/travel/article/20211125-the-age-old-mystery-of-a-uk-cathedral178