Comment by varjag

LHC had confirmed the existence of Higgs boson, essentially validating then-hypothetical mechanism for emergence of mass. It also had ruled out a very popular, theoretically beautiful but as it turned out invalid direction of physics studies. You can argue whether it was worth the cost but it was a genuine, significant experimental achievement.

It was also certainly not a PR stunt as it was truly an insanely complex piece of engineering. It is one of humanity's largest technological undertakings ever. Projects of this scale are still beyond the means even of the world's richest oligarchs. But it is a fine example of the things you can achieve in an enormous but well functioning multi-national bureaucracy.