  Radio galaxies have emerged as a new gamma-ray emitting source class on the
extragalactic sky. With their jets misaligned, i.e. not directly pointing
towards us, they offer a unique tool to probe some of the fundamental (and
otherwise hidden) non-thermal processes in AGN. This contribution briefly
summarizes the observed characteristics of the four radio galaxies detected so
far at very high energies (VHE). Given its prominence, particular attention is
given to the origin of the variable VHE emission in M87. We discuss some of the
theoretical progress achieved for this source within recent years highlighting,
amongst others, the relevance of magnetospheric particle acceleration and
emission models.
