Muon imaging, or "muography," may be a niche field, but with uses in probing both man-made and natural structures, its appeal is expanding rapidly. A new open-access review published in Reviews in Physics by Lorenzo Bonechi and Raffaello D'Alessandro from the Istituto Nazionale di Fisica Nucleare, Italy, and Andrea Giammanco, Université Catholique de Louvain Centre for Cosmology, Particle Physics, and Phenomenology, Belgium, looks at the history, current status, and future prospects of muography.