T'was seriously inspirational; it made me wish I was a couple of decades younger.
If I'd taken a camera I could attqch some serious geek-porn images. Unfortunately I didn't realise photos would be allowed nor that we would be in right in amongst the serious stuff, including ducking under the tube containing the synchrotron beam itself.
Plus, just like TNMoC, the people showing you around are seriously knowledgeable.
When booking, be aware the tickets are gone in minutes, not hours.
Highly recommended.