Scientific and practical arguments are offered in favor of a facility where to explore, with analogs, the otherwise unreachable territories of the theoretical investigations on the fundamental components of nature. In this facility, theorists, both of the high-energy and of the condensed matter types, should work next to experimentalists, mostly of the condensed-matter type, and technologists. I call this facility HELIOS, an evocative name for something that should shed light on the darkness of the unknown, and an acronym for High Energy Laboratory for Indirect ObservationS.