The non-gravitational nature of dark matter (DM) is one of the most important open questions in modern physics. In this talk, I will try to explore how existing and future telescopes can help us in the search for DM. In the first half, I will discuss how JWST observations can be used to look for DM signals. If DM is made up of eV-scale QCD axions or Axion-like particles (ALPs), then they can decay to two photons and the resulting line feature can contribute to the spectroscopic observations made by JWST. Using the existing JWST NIRSpec IFU observations, we are able to probe axions in mass ranges $\sim$ 0.47 and 2.55 eV. With this, we constrain well-motivated QCD axion and ALP-DM models. In the second half of my talk, I will explore how future MeV telescopes can be used to hunt for DM. MeVCube is a proposed CubeSat standard telescope that will try to probe the `MeV gap' in the gamma-ray sky. I will show that, built on a small development time and cost, MeVCube will be able to probe new regions of parameter space for decaying, annihilating particle DM and evaporating primordial black hole DM.