Perfect for the end of the school holidays with less tourists here.  Fantastic views over the Vezere river and valley.  Cheap to get in with good facilities, this is a good introduction to local prehistoric and more especially, medieval life in the area.  If I only had a few days to see the sights in the area Id skip this, as there are more important sites to see, but worth the visit.  Not so much interest for children.  Open all year except December.