  Exact solutions of Einstein's equations in 2+1-dimensional anti-de Sitter
space containing any number of black holes are described. In addition to the
black holes these spacetimes can possess ``internal'' structure. Accordingly
the generic spacetime of this type depends on a large number of parameters.
Half of these can be taken as mass parameters, and the rest as the conjugate
(angular) momenta. The time development and horizon structure of some of these
spacetimes are sketched.
