  These lectures briefly review our current understanding of classical and
quantum gravity in three spacetime dimensions, concentrating on the quantum
mechanics of closed universes and the (2+1)-dimensional black hole. Three
formulations of the classical theory and three approaches to quantization are
discussed in some detail, and a number of other approaches are summarized. An
extensive, although by no means complete, list of references is included.
(Lectures given at the First Seoul Workshop on Gravity and Cosmology, February
24-25, 1995.)
