  In the first part of this talk, I consider some exact string solutions in
curved spacetimes. In curved spacetimes with a Killing vector (timelike or
spacelike), the string equations of motion and constraints are reduced to the
Hamilton equations of a relativistic point-particle in a scalar potential, by
imposing a particular ansatz. As special examples I consider circular strings
in axially symmetric spacetimes, as well as stationary strings in stationary
spacetimes. In the second part of the talk, I then consider in more detail the
stationary strings in the Kerr -Newman geometry. It is shown that the
world-sheet of a stationary string, that passes the static limit of the 4-D
Kerr-Newman black hole, describes a 2-D black hole. Mathematical results for
2-D black holes can therefore be applied to physical objects; (say) cosmic
strings in the vicinity of Kerr black holes. As an immediate general result, it
follows that the string modes are thermally excited.
