  Massive gravity is a good theoretical laboratory to study modifications of
General Relativity. The theory offers a concrete set-up to study models of dark
energy, since it admits cosmological self-accelerating solutions in the vacuum,
in which the size of the acceleration depends on the graviton mass. Moreover,
non-linear gravitational self-interactions, in the proximity of a matter
source, manage to mimic the predictions of linearised General Relativity, hence
agreeing with solar-system precision measurements. In this article, we review
our work in the subject, classifying, on one hand, static solutions, and on the
other hand, self-accelerating backgrounds. For what respects static solutions
we exhibit black hole configurations, together with other solutions that
recover General Relativity near a source via the Vainshtein mechanism. For the
self-accelerating solutions we describe a wide class of cosmological
backgrounds, including an analysis of their stability.
