Reviewing the fundamental instrumental techniques and current observational results, this book unveils the mysteries of the physical processes in the central parsec of our Milky Way: the super-massive black hole embedded in a central stellar cluster as well as the gas and dust in the circumnuclear region.The observations described cover the entire electromagnetic spectrum from decimeter radio-waves to high energy X-ray and γ-rays, and a comprehensive summary of up-to-date astrophysical interpretations is given.The emphasis is put on observational techniques, image processing aspects, and a detailed presentation of the most cutting-edge work carried out in the near-infrared wavelength regime. These recent results include both the first orbits of stars around the central black hole and the multiwavelength variability of the central source.Contents:Observational Techniques:The GC Across the Electromagnetic SpectrumNIR Imaging Through the AtmosphereSpeckle ImagingSingle Telescope Adaptive OpticsCleaning and DeconvolutionFuture IR InterferometryObservational Results:The Discovery of Sagittarius A∗Large-Scale Structures at the Galactic CenterThe Circum Nuclear DiskThe Mini-SpiralRadio FilamentsNear-Infrared Images of the Central Stellar ClusterThe Radio and Infrared Positional Reference FramesNumber Density CountsPolarization of Filaments and StarsStellar Velocities and Orbital AccelerationsSpectroscopyStar Formation at the Galactic Center?Sgr A∗ Across the Electromagnetic SpectrumAstrophysical Results:The Stellar Velocity FieldScenarios for Star Formation at the Galactic CenterThe Central Dark MassStability of the Enclosed Dark MassAgglomerations of Exotic Particles?The Central Stellar CuspAnalysis of Stellar Orbits Near the Central Black HoleThe Central Black HoleComparison to Nuclei of Other GalaxiesMassive Black Holes at High RedshiftsReadership: Graduate and post-graduate students, researchers, astronomers, and astrophysicists.