  The most obvious extragalactic targets for optical/infrared interferometers
are Active Galactic Nuclei. In this document, I try to overview other topics
that could be of interest to studies of galaxies and whether they could be
adequate for a next generation interferometer. The very high spatial resolution
would be profitable for extragalactic supernovae, globular clusters, star
forming regions, gravitational lenses and some stellar studies in very close
galaxies. However, sensitivity is the main concern since the interesting
magnitude limit would have to be of the order of 25 or more for these studies
not to remain marginal.
