The Great Wall of China - collective name for defense systems composed of natural dams, the network of forts and towers of observation, and (in the most strategic places) walls of beaten earth, brick or stone, the lining of the northern China against invasions of the peoples of the Great Steppe.

Cheonggyecheon is a modern waterfront in downtown Seoul. It was developed as a massive urban renewal project, which utilized a stream that was covered before by the infrastructure and used for a public recreation space.