Cheongye Stream, known as Cheonggyecheon (청계천) in Korean, runs eastward through the heart of Seoul, passing through 13 neighborhoods in four districts of the capital of South Korea. Throughout its history, the stream played different roles in the city until it was covered by an elevated highway in the 1970s. For over 30 years, this natural artery remained hidden. It was not until 2003 that the city government launched a restoration project to reintegrate this urban waterway into the city fabric, revitalize the local economy, and revive the area's history and culture. The revitalization efforts were led by Mikyoung Kim Design. Since the project's completion in 2005, it quickly became one of Seoul's most visited tourist attractions. Moreover, it has become a focal point for ample urban research, with many studies offering positive assessments of the impact it had on Seoul's urban, economic, and ecological context.
On the morning of September 11, 2001, two hijacked commercial jetliners struck the Twin Towers in Lower Manhattan, a third plane struck the Pentagon, and a fourth crashed in rural Pennsylvania. A total of 2.977 people were killed in the terrorist attacks. In the face of this unprecedented loss, the city of New York promised to rebuild Lower Manhattan as a lively neighborhood while honoring and maintaining the memory of this day. Thus began one of the largest reconstruction projects in New York City, a process that is still ongoing now, 23 years after the tragedy.