In Canada, organized crime holds on to the $1000 notes. They're the largest value banknote commonly used in the West in the last few decades. They were last issued in 1992 and then officially withdrawn in 2000 for concerns over moneylaundering. They're not legal tender anymore, but can be exchanged at the bank. There's about $1 billion in circulation, and that will likely remain true for a long time yet. They move in a closed loop in the drug trade, stuffed in briefcases and in safes of criminals who effectively act as banks settling debts. No one wants to cash them because of the risk of being traced, but because they can be cashed in theory, they retain full value. The €500 is slowly displacing them, in Canada and abroad.
I saw one as a child. Most Canadians have not, as far as I know. An acquaintance of a friend of my father's had several, and my father was interested in numismatics, so he traded one for $100s. The implications of the man who had some "pinkies" (called so for their colour) being a biker with a facial scar didn't click into place until I was much older.