  We investigate the null geodesic flow and in particular the light rings
(LRs), fundamental photon orbits (FPOs) and shadows of a black hole (BH)
immersed in a strong, uniform magnetic field, described by the
Schwarzschilld-Melvin electrovacuum solution. The empty Melvin magnetic
Universe contains a tube of planar LRs. Including a BH, for weak magnetic
fields, the shadow becomes oblate, whereas the intrinsic horizon geometry
becomes prolate. For strong magnetic fields (over-critical solutions), there
are no LRs outside the BH horizon, a result explained using topological
arguments. This feature, together with the light confining structure of the
Melvin Universe yields \textit{panoramic shadows}, seen (almost) all around the
equator of the observer's sky. Despite the lack of LRs, there are FPOs,
including polar planar ones, which define the shadow edge. We also observe and
discuss chaotic lensing, including in the empty Melvin Universe, and multiple
disconnected shadows.
