  Radio Galaxies have by now emerged as a new $\gamma$-ray emitting source
class on the extragalactic sky. Given their remarkable observed
characteristics, such as unusual gamma-ray spectra or ultrafast VHE
variability, they represent unique examples to probe into the nature and
physics of AGN in general. This review provides a compact summary of their
observed characteristics at very high $\gamma$-ray energies (VHE; $> 100$ GeV)
along with a discussion of their possible physics implications. A particular
focus is given to a concise overview of fundamental concepts concerning the
origin of variable VHE emission, including recent developments in black hole
gap physics.
