My wife and I are in Germany for two weeks and we just arrived in Frankfurt. We have a day here to kill before starting our driving tour through Bavaria so the first thing we did was head to the subway and make our way to Russelsheim to the "OpelWerks" stop to see the factory. I snapped a few pictures and then we headed right back to Frankfurt because it turns out that stop must be specifically for the factory workers as we couldn't find an exit that didn't require a badge (i.e., the exists all apparently lead onto the grounds of the factory). While it wasn't much to look at from outside, for me it was a great Opel experience just being there. I also had to snap a photo of a funny sign that appears to warn that hooligans will not be tolerated .