The stained glass in the age of 1000 years

The total area of stained glass, accidentally preserved in the Cathedral of Notre-Dame (Chartres) , France, at the beginning of the 21st century. is about 2000 m2. More than 150 Cathedral window, ancient stained glass of the Cathedral of the 12th century. Just think - the oldest stained glass in the Cathedral, 1,000 years!