I'm presently traveling in East Asia with colleagues from Grinnell College on a tour of major cities, including Tokyo, Seoul, and Beijing, with one-day stints in Nanjing and Shanghai, as well. We're currently in Beijing--just got in last night. The last full day in Seoul we had a chance to walk along the stream in Cheonggyecheon, site of a major reclamation project, in downtown. Used to be that an elevated highway ran through this area, and now, this:
More about this project here. A nice respite from an otherwise car-centric city.