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(also inside: this manuscript introduces the reader to the argument againstthe existence of magnetic monopoles, which forms an essential part ofStaruszkiewicz's Quantum Mechanics of the Electric Charge)  Ultra-high energy (UHE) photons with energies exceeding $10^{18}\eV$ canpotentially be observed. They are produced in various processes involvingelectrically charged particles. However, more exotic scenarios are alsopossible. UHE photons could be emitted in encounters of massive magneticallycharged monopole--antimonopole pairs or in processes associated with monopolesaccelerated to high energies, typically $10^{21}\eV$ or beyond. Observing UHEphotons can pose constraints on the properties of magnetic monopoles.  There are compelling theoretical reasons in favor of the presence of magneticmonopoles in nature. The predicted observational signatures of these particlesare therefore searched for in dedicated experiments currently in operation.Despite these attempts, magnetic monopoles have yet to be empirically proved.  There are also theoretical reasons why magnetic monopoles allowed by Dirac'stheory might not be realized in nature in the form of isolated particles.Detection or non-detection of UHE photon signatures of magnetic monopoles wouldbring us closer to solving this fascinating puzzle.

On the issue of magnetic monopoles in the prospect of UHE photon searches