  We observe the parallel between the null Killing vector on the horizon and
degenerate Killing vectors at both north and south poles in Kerr-Taub-NUT and
general Plebanski solutions. This suggests a correspondence between the pairs
of the angular momentum/velocity and the NUT charge/potential. We treat the
time as a real line such that the Misner strings are physical. We find that the
NUT charge spreads along the Misner strings, analogous to that the mass in the
Schwarzschild black hole sits at its spacetime singularity. We develop
procedures to calculate all the thermodynamic quantities and we find that the
results are consistent with the first law (Wald formalism), the Euclidean
action and the Smarr relation. We also apply the Wald formalism, the Euclidean
action approach, and the (generalized) Komar integration to the electric and
magnetic black holes in a class of EMD theories, and also to boosted black
strings and Kaluza-Klein monopoles in five dimensions, to gain better
understandings of how to deal with the subtleties associated with Dirac and
Misner strings.
