The Millennium Gate - Credit: Wikimedia Commons
The Millennium Gate (Native name: , Nickname: Seoul Ring) was envisioned in 2000 as the world's first mega-sized ring-shaped architectural structure. It was planned to be erected along the Han River in Sangam-dong, Seoul, in conjunction with the new millennium (Millennium), and the 2002 Korea-Japan FIFA World Cup (2002 FIFA World Cup). Read more on Wikipedia
Source: en.wikipedia.org