We discuss the discovery potential of the Dark-photons & Axion-like particles Interferometer in this paper. The apparatus, currently in a design and prototyping phase, will probe axion dark matter from the Teide Observatory, an environment protected from terrestrial microwave sources, reaching Dine-Fischler-Srednicki-Zhitnitsky-like axion sensitivity in the range 25 - 250 μ eV of mass. The experimental approach shows a potential to probe dark sector photons of kinetic mixing strength in excess of several 10-16 and to establish new constraints to a stochastic gravitational wave background in its band. We identify different branches, including cosmology, stellar, and particle physics, where this next-generation halo-telescope may play a role in coming years.