The CMN undertakes interior and exterior works to improve facilities for the visiting public. These works have to strike a balance between preserving the heritage of monuments and making them accessible to visitors.

They can entail a variety of activities:

• creating a reception area / ticket office / shop 
• ensuring the site is accessible to everyone, including the disabled 
• creating a visitors’ tour circuit 
• designing associated cultural spaces: learning workshops, auditoriums, educational spaces, projection rooms, scenography 
• fitting out of restaurants / tea rooms 
• provision of specific areas of the property: catering premises, reception rooms, etc. 

These facilities are generally permanent, but may also be temporary (for events, exhibitions, etc.)