Because of the Earth's atmosphere shield, gamma-ray astrophysics could not develop until it was possible to get detectors on spacecrafts, and to build large and sensitive ground-based detectors. In this last class, Imaging Air Cherenkov Telescopes (HESS and MAGIC in particular), based on technologies developed in high-energy physics, have recently provided many successful observations and measurements. This seminar summarizes the results from the first years of operation of the MAGIC telescope at La Palma, Canary Islands, and presents the expected developments of the sector of VHE gamma astrophysics for the next years, both from the point of view of astrophysics and of fundamental physics (as extreme tests of the Lorentz invariance and measurement of the cosmological constants).