  Asteroseismology of massive stars has recently begun a revolution thanks to
high-precision time series photometry from space telescopes. This has allowed
accurate and robust constraints on interior physical processes, such as mixing
and rotation in the near-core region of stars, to be determined across
different masses and ages. In this review, I discuss recent advances in our
knowledge of massive star interiors made by means of gravity-mode
asteroseismology, and highlight some new observational discoveries of
variability in some of the most massive stars in our universe.
