From the largest, the strongest, the longest and the most impressive this article covers all bases with some good pictures as well as description..
This is a much contested claim, but it seems the Notre Dame cathedral in Paris holds the record for the world’s biggest window. The south rose window at the cathedral is massive, measuring in at 12.9 metres in diameter, containing 84 panes of glass. This is said to be the biggest window in the world and you couldn’t ask for a more beautiful window.
The west rose window is slightly smaller but still a stunning stained glass window measuring 10 metres in diameter. It dates all the way back to 1220 AD and has most of the original glass and tracery still, an impressive feature I’m sure you’ll agree.