Three-Dimensional Structure of the Magellanic System
  We have determined the three-dimensional structure of the Magellanic Clouds
and Magellanic Bridge using over $9\,000$ Classical Cepheids (CCs) and almost
$23\,000$ RR~Lyrae (RRL) stars from the fourth phase of the OGLE project.
  For the CCs we calculated distances based on period-luminosity relations. CCs
in the LMC are situated mainly in the bar that shows no offset from the plane
of the LMC. The northern arm is also very prominent with an additional smaller
arm. Both are located closer to us than the entire sample. The SMC has a
non-planar structure that can be described as an ellipsoid extended almost
along the line of sight. We also classified nine of our CCs as Magellanic
Bridge objects. These Cepheids show a large spread in three-dimensions.
  For the RRL stars, we calculated distances based on photometric metallicities
and theoretical relations. Both Magellanic Clouds revealed a very regular
structure. We fitted triaxial ellipsoids to our LMC and SMC samples. In the LMC
we noticed a very prominent, non-physical blend-artifact that prevented us from
analyzing the central parts of this galaxy. We do not see any evidence of a
bridge-like connection between the Magellanic Clouds.
