The other GGG topics added since the previous digest ping, alpha:
Tunnels for soldiers — to flee? or for new soldiers to come to the aid of the castle?
The Sforza was featured prominently in the series “The Borgias.”
Maybe some of those tunnels were where the better qualities of Prosecco sparkling wines or perhaps even the Brunello di Montalcino Reds were stored.
Tunnels for pizza...defending a castle is hungry work...