Massive star formation is known to proceed in a clustered mode at relatively large distances. Therefore, high spatial resolution is essential to investigate the physical and chemical processes taking place in these regions. I will present recent interferometric high angular resolution observations (from the SMA, PdBI, and ATCA) toward the earliest stages of high-mass star formation, disentangling their complex internal structures, e.g., multiplicties, kinematic structures potentially due to rotation, chemical inventories, ...