  We consider higher dimensional topological Taub-NUT/Bolt-AdS solutions where
a cosmological constant is treated as a pressure. The thermodynamic quantities
of these solutions are explicitly calculated. Furthermore, we find these
thermodynamic quantities satisfy the Clapeyron equation. In particular, a new
thermodynamically stable region for the NUT solution is found by studying the
Gibbs free energy. Intriguingly, we also find that like the AdS black hole
case, the G-T diagram of the Bolt solution has two branches which are joined at
a minimum temperature. The Bolt solution with the large radius, at the lower
branch, becomes stable beyond a certain temperature while the Bolt solution
with the small radius, at the upper branch, is always unstable.
