  Globular clusters are among the oldest structures in the Universe and they
host today low-mass stars and no gas. However, there has been a time when they
formed as gaseous objects hosting a large number of short-lived, massive stars.
Many details on this early epoch have been depicted recently through
unprecedented dissection of low-mass globular cluster stars via spectroscopy
and photometry. In particular, multiple populations have been identified, which
bear the nucleosynthetic fingerprints of the massive hot stars long
disappeared. Here we discuss how massive star archeology can been done through
the lens of these multiple populations.
