  We present a review of observational studies of high-mass star formation,
based mainly on our own research. It includes surveys of high-mass star-forming
regions in various molecular lines and in continuum, investigations of
filamentary infrared dark clouds, which represent the earliest phases of
massive star formation, detailed studies of individual high-mass star-forming
regions, dense cores and disks harboring massive (proto)stars, and associated
outflows. Chemistry in these regions is discussed, too.
