  Gamma-ray astronomy provides a direct window into the most violent, dynamic
processes in the Universe. MeV gamma-ray astronomy in particular allows us to
directly observe the process of chemical enrichment of the interstellar medium
(ISM) through the decay of radioactive isotopes synthesized by stars and
compact objects during their lives, in their death throes and after their
deaths. Moreover, gamma-ray lines such as the positron annihilation line can
give us a unique view into the propagation of cosmic rays in the Galaxy, as
well as hints about unusual transient phenomena that may be responsible for
producing the positrons. With modern astrophysics moving forward into a new era
of multimessenger astrophysics, the important contributions of MeV gamma-ray
astronomy must not be overlooked. I briefly outline some of the important
contributions gamma-ray spectroscopy with \textit{INTEGRAL} has made to our
understanding of the universe, and the future perspectives for this dynamic
field of astrophysics.
