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In his Nobel Prize lecture Victor Hess urged that different instruments,working together, should be used to solve the problem of the origin of cosmicrays. I review some of the key developments that have opened up the new fieldsof direct and indirect multi-messenger astronomy and that are guiding us to thesolution of this riddle. I then discuss, very briefly, some of the newinstruments that are shortly to come on line and give examples to show the longlead-times from conception to implementation that occur in this field. Iconclude with some remarks about very ambitious future projects. The paper isnot intended as a review: rather it is an attempt to set down issues discussedin the Hess Memorial Public Lecture given at the 2019 ICRC in Madison,Wisconsin and accessible at www.icrc2019.org.

The Origins of the Highest Energy Particles in Nature: where we are and where we go next