Searches for new phenomena with the ATLAS detector

Many theories beyond the Standard Model predict new phenomena accessible by the LHC. Searches for new physics are performed using the ATLAS experiment at the LHC focusing on exotic signatures that are predicted in several theories, excluding supersymmetry. The results of recent searches using 13 TeV data, with the exception of those for Dark Matter signatures, and their interplay and interpretation are presented. Prospects for searches at High Luminosity LHC are also discussed.