The daily rat race is one of those activities we often dread, but do out of necessity. The rush hour commotion can be felt and seen on city roads, sidewalks and transit lines, but in a city as cold as Toronto walking the final home stretch from your car, subway train or streetcar can be the most treacherous part of a commute. Thankfully, an elaborate underground city exists below our busy downtown streets, and these tunnels known as the PATH system can be quite lively during winter workdays.  Today's photo of the day comes from Forum member Lenser, and shows the busy yet beautiful world which thrives below grade.

Underground City, image by Lenser