One of the runners-up for the world’s most elaborate example of casino neon outside of Las Vegas is without a doubt the Casino Espinho in Espinho, Portugal!
Casino Espinho has been in operation since 1974 and it can only be assumed the neon signs that adorn the casino have been around for just as long. The neon playing cards extend around one whole side of the building and can probably be seen for miles away from the casino itself!
https://www.solverde.pt/casino-espinho/ (Casino Espinho homepage)
Image copyright: Adrián Pérez. Used via Flickr and Wikimedia Commons per CC Attribution 2.0 Generic license.)