It's not well marked for tourists. We were dropped at a service entrance. The folks working there provided us with instructions to another spot on the campus which ended up being wrong, but those folks pointed us in the right direction and we eventually made it. Tip: Call ahead of time to get a tour scheduled. We did, but were told to just show up and get a tour. Then, the woman who was to lead the tour was not around and her colleague was not sure when she would be back. We were each given a free beer though and we got to explore via trying to find the spot to meet up with the leader so we were happy! Also, it was fun to see all the employees walking around in their badges (a strong reminders one of any corporate campus). read more