Whether you’re new to Washington or you’ve lived here your whole life, WalkingTown D.C. will teach you something about the city. Dozens of guided tours are offered over the course of nine days, showing how famed landscaper Frederick Law Olmsted remade the U.S. Capitol grounds; revealing sites related to the Watergate break-in; or leading walkers through the narrow passages of Blagden Alley and Naylor Court in search of stables and hints of “Old Washington.” All tours are free and last one to two hours, but reservations are required, and the most popular walks fill up early. When: Saturday through Sept. 24. Where: Locations vary. culturaltourismdc.org. Tickets: Free.