These links can be useful to see what is going on close to you… and there are other links on Google… so you’ve no excuses for missing something interesting…
this is basic France:
http://www.journees-du-patrimoine.com/
and this is Europe…
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Thank you for the link Stella, some very interesting places to visit both ‘locally’ and in neighbouring departments 
There should be something for everyone… and many places are not open to visitors any other time… 