You should probably have a tour guide on your first time there. Personally I was a bit confused which of the climate-controlled rooms I was actually allowed to

You should probably have a tour guide on your first time there. Personally I was a bit confused which of the climate-controlled rooms I was actually allowed to enter (the doors all look like highly secure entrypoints). So I felt like I missed out on some exhibits and only scratched the surface of what they had on display (vs. in a filing cabinet).