Fort KnoxˌFort ˈKnox 
people often use the name ‘Fort Knox’ when talking about a place that is extremely well guarded or impossible to enter without permission. It comes from a military building in the US state of Kentucky which holds the government’s store of gold: 
His house is like Fort Knox.
people often use the name ‘Fort Knox’ when talking about a place that is extremely well guarded or impossible to enter without permission. It comes from a military building in the US state of Kentucky which holds the government’s store of gold: His house is like Fort Knox.