Cheonggyecheon

"Located below street level, the public space Cheonggyecheon offers an easy escape from the hustle and bustle of downtown Seoul . The area is part of a massive urban renewal project in which an old elevated highway was cleared to reveal the stream below. To find the entrance, look for Claes Oldenburg’s sculpture Spring Tower , which resembles a giant unicorn horn, and from there you can enjoy a serene 3.6-mile walk that meanders past art installations, graceful fountains, and green rest areas. Duck out at any point on one of the 22 overhead bridges that cross the stream, or walk to the end of the trail and visit the free Cheonggyecheon Museum to learn more about the area."