High Energy Gamma-Ray Astronomy is one of the most exciting fields in particle physics and astrophysics. The currently working Cherenkov
telescopes, HESS, MAGIC, and VERITAS have discovered more than 200 sources in the sky above 100 GeV energies. The understanding of the
high-energy Universe is getting deeper and deeper.
We can discuss the recent highlights in high-energy gamma-ray observations, the discovery of TeV gamma-ray emission from the high-energy neutrino source, and the discovery of TeV gamma-ray bursts by MAGIC and HESS. For the further development of high energy gamma-ray astronomy, the open observatory CTA is under construction in La Palma in the Canary Islands. The first Large Size Telescope (LST) of 23 m diameter has just started the regular operation, and another three more LSTs are coming in three years. The array of four LSTs will deliver the exciting discoveries with the world's best sensitivity above 20 GeV energy and make a significant contribution to observation of the TeV-GRBs and distant AGNs, and also offer the dark matter search. We will discuss the current status of high energy gamma-ray astronomy and future prospect in this seminar.
Fabio Ferrarotto, Maurizio Iori