  Over the past ten years, there has been a revolution in our understanding of
massive young stellar clusters in the Galaxy. Initially, there were no known
examples having masses $>10^4$, yet we now know that there are at least a half
dozen such clusters in the Galaxy. In all but one case, the masses have been
determined through infrared observations. Several had been identified as
clusters long ago, but their massive natures were only recently determined.
Presumably, we are just scratching the surface, and we might look forward to
having statistically significant samples of coeval massive stars at all
important stages of stellar evolution in the near future. I review the efforts
that have led to this dramatic turn of events and the growing sample of young
massive clusters in the Galaxy.
