Castle of the Dukes of Brittany
The castle of the Dukes of Brittany is so huge it did not fit entirely on any of my photos. I tried a handheld panoramic photo, but the views do not join correctly. The fortress indeed has 500 meters of walls with huge towers such as the one on this photo. It was built in the 15th century both as a military stronghold and as a ducal residence.
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Photo from: <a href="http://www.france-in-photos.com/">France in Photos</a>