The LHC was actually built from 1998 to 2008. It started to operate in 2011. In 2010, there was an incident that delayed the whole process.
Note that there will be a long shutdown very soon, so that it may be a unique chance to go underground.
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You are right. What I saw was a multitude of billboards around the Leman Lake presenting the phases of construction. There is much science to be analyzed, maybe tens of work-years from now, as was/is the case for Cassini.
I just saw you cofounded SteemSTEM :D It's an honor, I will not let the community down.
Thanks for your nice comment :)