Indirect Dark Matter [DM] searches are based on the detection of secondary particles and radiation produced by the self-annihilation of DM particles. Although the predicted annihilation flux is typically affected by large astrophysical uncertainties, the detection of multiwavelenght photons, neutrinos or anti-matter from regions with high DM density would be of paramount importance for the identification of DM particles. In fact, accelerator searches at the Large Hadron Collider and other DM direct detection experiments, will not necessarily unveil the nature of DM, even if new particles are discovered , due to the difficulties associated with the reconstruction of the cosmological abundance of the newly discovered particles. In the framework of indirect DM searches, several strategies have been devised, in order to obtain conclusive evidence from astrophysical observations. In this talk, I will discuss the possibility of indirect DM detection through gamma-ray observations by searching for peculiar features in the diffuse gamma-ray spectrum such as sharp lines or characteristic features in the angular correlation signal.