  The stellar content of young massive star clusters emit large amounts of
Lyman continuum photons and inject momentum into the inter stellar medium (ISM)
by the strong stellar winds of the most massive stars in the cluster. When the
most massive stars explode as supernovae, large amounts of mechanical energy
are injected in the ISM. A detailed study of the ISM around these massive
cluster provides insights on the effect of cluster feedback. We present high
quality integral field spectroscopy taken with VLT/MUSE of two starburst
galaxies: ESO 338-IG04 and Haro 11. Both galaxies contain a significant number
of super star clusters. The MUSE data provide us with an unprecedented view of
the state and kinematics of the ionized gas in the galaxy allowing us to study
the effect of stellar feedback on small and large spatial scales. We present
our recent results on studying the ISM state of these two galaxies. The data of
both galaxies show that the mechanical and ionization feedback of the super
star clusters in the galaxy modify the state and kinematics of the ISM
substancially by creating highly ionized bubbles around the cluster, making the
central part of the galaxy highly ionized. This shows that the HII regions
around the individual clusters are density bounded, allowing the ionizing
photons to escape and ionize the ISM further out.
