We just visited the Caves at Orgnac and the guided tour was excellent – very informative and also funny. There is a marvellous hidden universe down there that is incredible to behold. The kids were fascinated by it all.
As well as the cave tour there is an excellent interactive museum and demonstrations on how people first learnt to make fire.
Well worth a visit – for all ages. The tour lasts between an hour and an hour and a half, they go every 30 minutes.
There are 700 steps down into the cave but thankfully a lift brings you back to the surface.