If you happen to be there during a shutdown for maintenance or long shutdown, there is a great chance that you can get an on-site tour that will show you the machines itself. There are other tours too.
First of all, I never saw any place better organized, not a smidge of dust, thousands of cables arranged perfectly. And then you get to collider/detector part which is this massive maybe 15m wide long cylinder, opened completely, and it looks like from sci-fi novels.
Just the scale and evident competence of building such a hyper complex unique thing... I live in Switzerland, pretty used to well organized stuff but this was next level.