IFAE, the Institute for High Energy Physics at the Universitat Autònoma de Barcelona (UAB), which conduct experimental and theoretical research at the frontiers of fundamental physics, namely in Particle Physics, Astrophysics and Cosmology and also work at the cutting edge of detector technology, putting our know-how to the service of more practical goals. IFAE has its own permanent research and technical staff in addition to UAB faculty and ICREA research staff. More than half of the Institute personnel consist of postdoctoral fellows and PhD students. Since 2005, a group at IFAE, together with a group at ICE (Institut de Ciències de l’Espai) and another at CIEMAT (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas) in Madrid, collaborates in the Dark Energy Survey (DES) international project, led by Fermilab (USA). The main goal of the project is to survey 5000 deg2 of the southern galactic sky, measuring positions on the sky, shapes and redshifts of about 300 million galaxies and 15000 galaxy clusters. Furthermore, another 10 deg2 of the sky will be repeatedly monitored with the goal of measuring magnitudes and redshifts of over 1000 distant type-Ia SNe. These measurements will allow detailed studies of the properties of the so-called “dark energy” that drives the current accelerated expansion of the universe. In IFAE consists The Cherenkov Telescope Array (CTA) will be an advanced facility for ground based very- high-energy gamma ray astronomy, based on the observation of Cerenkov radiation. It builds on the mastering of the Imaging Atmospheric Cherenkov Telescope technique developed by the H.E.S.S. and MAGIC installations. From the successes of H.E.S.S. it exploits the concept of telescope arrays and stereoscopic analysis for educating the current sensitivity by one order of magnitude. From the success of MAGIC it exploits the use of large telescopes to attain the lowest possible threshold. Both methods have proven to be extremely successful for gamma rays of energies above few tens of GeV and have wide-open a new window in astronomy: the detailed study of the universe at the largest energies to study the most extreme astrophysical phenomena and fundamental physics.