The Volcanic Ambient Route.

A small subset of the atlas treats the planet itself as the sound system. Stromboli erupts on a twenty-minute cycle; the ambient sound is its own programme. Iceland's Harpa Concert Hall sits between geothermal vents and the North Atlantic; the building is engineered to muffle one and frame the other. The Bedouin festivals of the Hoggar plateau in Algeria gather at altitude in winter, when the desert hums in the cold. This route is for travellers who want the natural-site half of the atlas. Three weeks. Long flights. Worth it.