Lace up your sneakers and get your bikes in gear, it's time for the annual WalkingTown/Biking Town DC event! Cultural Tourism DC hosts eight days and 100 trails of free guided tours through the city. The tours can be done over lunch, or with friends for a "happy hour" tour after work. History, art and exercise come together for a fun time during WalkingTown/BikingTown DC Sept. 24-Oct. 1. Check the website for a full list of events.