  One of key scientific objectives of the Pierre Auger Observatory is the
search for ultra-high energy photons. Such photons could originate either in
the interactions of energetic cosmic-ray nuclei with the cosmic microwave
background (so-called cosmogenic photons) or in the exotic scenarios, e.g.
those assuming a production and decay of some hypothetical super-massive
particles. The latter category of models would imply relatively large fluxes of
photons with ultra-high energies at Earth, while the former, involving
interactions of cosmic-ray nuclei with the microwave background - just the
contrary: very small fractions. The investigations on the data collected so far
in the Pierre Auger Observatory led to placing very stringent limits to
ultra-high energy photon fluxes: below the predictions of the most of the
exotic models and nearing the predicted fluxes of the cosmogenic photons. In
this paper the status of these investigations and perspectives for further
studies are summarized.
