From half a billion buried in a Polish palace to submarines full of glittering loot, ‘lost Nazi gold’ is an urban myth which refuses to die - but there IS one place where there genuinely is a huge amount of Nazi treasure still waiting to be discovered. Author and historian Guy Walters talks to World War 2 expert James Holland on why most hoards of Nazi treasure are never found - and where the thugs of the Third Reich REALLY hid their loot (so safely that it’s still there today).