CHATEAUX OF THE LOIRE | CHATEAUX
The castle of Brézé, in Loire Valley
Château de Brézé 49260 BREZE (FRANCE)
Tel : +33 2 41 51 60 15 - Fax : +33 2 41 51 65 15 - Website :
https://www.chateaudebreze.com
Our guide's opinion : 
A château beneath a château : the astonishing underground fortress near Saumur.