Each museum or monument decides its own policy in terms of free admission, reductions, and priority access for disabled people and accompanying person. Where admission is free or where there is a reduction (proposed in most cultural and recreational venues), proof may be requested, such as a European Parking Card, disability official proof delivered by your country, or a medical document dated within 3 months of the time of your visit.
For more information on the tariff policy of each museums and monuments, click on the tab 'disability' on the fact file page for each places.
Find out more:
Practical information for disabled people