  Our team has obtained observations of the photosphere of the two closest red
supergiant stars Betelgeuse ($\alpha$ Ori) and Antares ($\alpha$ Sco) using
near infrared interferometry. We have been monitoring the photosphere of
Betelgeuse with the VLTI/PIONIER instrument for three years. On Antares, we
obtained an unprecedented sampling of the visibility function. These data allow
us to probe the convective photosphere of massive evolved stars.
