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The answer to the question in the title is: in search of new physics beyondthe Standard Model, for which there are many motivations, including the likelyinstability of the electroweak vacuum, dark matter, the origin of matter, themasses of neutrinos, the naturalness of the hierarchy of mass scales,cosmological inflation and the search for quantum gravity. So far, however,there are no clear indications about the theoretical solutions to theseproblems, nor the experimental strategies to resolve them. It makes sense nowto prepare various projects for possible future accelerators, so as to be readyfor decisions when the physics outlook becomes clearer. Paraphrasing GeorgeHarrison, "If you don't yet know where you're going, any road may take youthere."

Where is Particle Physics Going?