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The medieval 'doomsday bunker' hidden beneath a French castle (video)
[BBC] At first sight, there is little clue to the secrets that lie beneath the Château de Brézé in France. Below the surface of this impressive castle lies a deep network of tunnels and rooms that form one of Europe's largest underground fortresses.

Much like the billionaires of today, the lords of this castle carefully constructed themselves a medieval 'doomsday bunker' to provide themselves with shelter and protection in the face of invasion or disease.
Posted by: Besoeker 2020-04-27
http://www.rantburg.com/poparticle.php?ID=569903