Hue - The Citadel - 2006
These are the walls around the “Citadel” (Kinh Thanh) in Hue. Constructed beginning 1804 the perimeter is 10km, with the moat to the right and the inner walls to the left. This is just across from the main town and easily toured by cyclo; though I'd recommend arranging an english-speaking driver, or a guide, through your hotel or an agency.