a little Off-Topic but if you ever get to visit Geneva, there is a permanent exhibition at CERN to show how the LHC work and what is the organization around it to collect information, keep it running... etc... it is rather kid friendly 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.