  The dynamics of black hole spacetimes play a crucial role in astrophysics,
high energy physics and fundamental physics. In this thesis I have investigated
the dynamics of black holes in generic spacetimes by extending established
numerical relativity methods to higher dimensional or non-asymptotically flat
spacetimes. Additionally, I have explored BH spacetimes perturbed my massive
scalar fields. By developing and further improving NR techniques I have been
able to push our knowledge to new grounds.
