Photonic crystals are man-made structures that exhibit optical energy bands in much the same manner as electronic bands in crystalline solids. Photonic band gaps are thus feasible. These are forbidden regions for photons at certain specific energies, and have technological applications in high-density integrated photonic circuits and highly efficient on-chip lasers. Although research on photonic crystals is about 10 years old, the extension of these structures to magnetic materials has only just begun over the last few years. Already a number of useful features have been demonstrated both theoretically and experimentally, such as the ability of significantly enhancing the specific Faraday rotation in magnetic garnet structures. These achievements will be useful for a new generation of integrated optical isolators, a crucial component in optical telecommunications systems. The talk will give a brief introduction to photonic crystals and discuss their extension to magnetic structures and techniques for fabricating integrated devices composed of magnetic photonic crystals.