It has become possible in the last 5 decades to observe the Universe at wavelengths for which the atmosphere is opaque. This new window on the the Universe has led to the discovery of many completely unexpected phenomenologies. Powerful sources have been found that are fueled by gravitation, magnetic fields or particle decays, but only very seldom by the more common energy source of stars, fusion.
INTEGRAL is a large European mission devoted to astronomical observations in the hard X-rays and gamma rays. It has been launched by a PROTON rocket in October 2002 and has been working very well ever since. The data are processed and distributed by the INTEGRAL Science Data Centre (ISDC) hosted by the University of Geneva.
A selection of the results obtained in the last almost five years since the launch of INTEGRAL will be presented. This will illustrate how different our view of the Universe has become from that inherited from observations limited to the visible domain of the electromagnetic spectrum.