[jimtorr]

I watched the videos. Very cool.

Much of the countryside of France is virtually unknown to most Americans. I saw another set of videos not long ago about another chateau with very extensive underground rooms.

[mass55th]

I subscribe to another channel on YouTube called So Chateaux (in English). It offers videos of exclusive tours of French châteaux (and sometimes other European ones), guided by the best possible hosts — the owners themselves.

Here's the link if you're interested:

SoChateaux