I had trouble finding out the details for this attraction. It is open to the public all the time as you can walk around it and through the outside walls anytime. There are Museums inside which you need to pay for. We went to the Normandy one which has the history from prehistoric times which was interesting. We were only there an hour which was enough time to climb onto the walls and have a quick look around. You would need much more time to really explore it.
As with everywhere we went there were school groups there as well.
We found parking on the street but there is an underground car park. There must be a University near there as there were lots of students around the place.
No bathrooms - except in the museums.
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