While Chicago reached record low temperatures, some passionate photographers braced the cold to capture these shots of the Polar Vortex over the city. Here are some phenomenal pictures and videos documenting the unbelievable cold from the Trib, Jessica Koscielniak, Shawn Reynolds, @GoogleEarthPics, RedEye, Huffington Post and, of course, our own flickr pool. We recommend you enjoy these from inside a heated space.