Thats a big task there.

Do you want the closed casinos also?
Do you also want the riverboats and cruise ships?
How about illegal casinos?
do poker rooms count?
bingo halls?
traveling carny games?

good luck.

Here's a website one of the other posters previously posted about. It will give you a hand with European Casinos.

http://www.templesofgambling.it/elenco.htm