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Variable stars have been used for over one hundred years as probes fordetermining astronomical distances; these distances can be used to map thethree-dimensional (3D) structure of nearby galaxies. Exploiting the effect thatmoving to the mid-infrared has on Cepheid magnitudes and light curves, we cannow map our nearest galaxies in 3D at fidelities never before achievable.Combining data from the OGLE-IV catalogue with mid-infrared photometry from theSpitzer Space Telescope, around 5000 fundamental mode Cepheids are being usedto trace the 3D structure of the Magellanic Clouds. An automated photometrypipeline has been developed to obtain precise mean magnitudes and light curvesfor Cepheids in the Magellanic System, which in turn produces distancemeasurements for individual Cepheids accurate to 5%. The resulting detailedmaps are being used to probe the geometric and chemical structure of theMagellanic Clouds, as well as their interaction and dynamical histories.Initial results from this project are discussed and the future inclusion of RRLyrae stars to trace the old stellar population of the system is described.

3D maps of the Magellanic Clouds using Classical Cepheids