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Chartres Cathedral is one of the most impressive gothic cathedrals in Europe. It is also the most well preserved one.
It can be found not far from Paris, in the town of Chartres. It is most famous for its labyrinth and its transepts.
There aren`t many other well preserved cathedrals like the Chartres in the world. The one in Cologne, although looks gothic, it is in fact a 19th century cathedral.
Source link: http://www.chartrescathedral.net