eric rupert
Google
The tickets sign at the main entrance points AWAY from where you buy tickets. I didn't see a ticket stand/office, so I asked at the shop, and was told to to buy them "inside the green door [opposite the sign directing to tickets]," but was scolded for going in that room, because it's security (not security's fault, other than they had no indication it's security, and to knock or whatever).
The open exhibits are really cool, if you're an industrial process nerd 🤓
Unfortunately, 2 sections of the main tour were closed off (very disappointing to not be able to learn what I came for), as well as the watchtower, which the guide book highly recommends!
There were no guided tours available, which I may have been interested in.