Castle built atop a Fortress - Château de Brézé - Bellevigne-les-Châteaux, France - Beneath its foundation lies one of Europe's largest underground fortress - Connected by more than 3 kms of tunnels

Château de Pesteils (Forteresse de Polminhac) - Polminhac, Cantal, France - Mentioned 13th century - Square keep built by Jean de Foulhols 14th c. - Main building added 15th c. - Rebuilt

The Underground Fortress of Château de Brézé

Chateau de Breze – The Castle And Its Underground Empire – Geekometry

Fortresses, Castles & Palaces in France - Archaeology Travel

The Underground Fortress of Château de Brézé

Loire Castle France - ䷞ CHATEAU DE BREZE - Saumur wine

The underground fortress at Château de Brézé

The underground fortress at Château de Brézé

Castle built atop a Fortress - Château de Brézé - Bellevigne-les-Châteaux, France - Beneath its foundation lies one of Europe's largest underground fortress - Connected by more than 3 kms of tunnels

Caves and castles – Les Terrasses de Dordogne

Castle built atop a Fortress - Château de Brézé - Bellevigne-les-Châteaux, France - Beneath its foundation lies one of Europe's largest underground fortress - Connected by more than 3 kms of tunnels

This Medieval French Castle Is Hiding Almost Two Miles Of Secret Tunnels (& You Can Visit Them)

The Château de Brézé - Tourism & Holiday Guide