In the last decades, a large variety of low-energy positron beams has been built based on β⁺ sources. However, the available maximum intensity of laboratory beams is limited to about 10⁷ moderated positrons per second. For this reason, several setups have been developed at large-scale facilities such as electron accelerators and research reactors in order to generate high-intensity positron beams using the conversion of high-energy γ radiation into positron-electron pairs. Within this contribution, first the experimental constraints and the physical basics, how positrons can be produced and how positron sources are realized, are reviewed. In the second section the moderation of positrons is briefly described. This leads to the principal scheme of the positron beam setup in the laboratory scale and to an overview of existing and possible future large-scale positron beam facilities. Finally, the NEutron-induced POsitron source MUniCh NEPOMUC with its instrumentation is presented.