Songdo International Business District is a new smart city or "ubiquitous city" built from scratch on 600 hectares (1,500 acres) of reclaimed land along Incheon's waterfront, 65 kilometres southwest of Seoul, South Korea and connected to Incheon International Airport by a 12.3-kilometre reinforced concrete highway bridge, called Incheon Bridge. Along with Yeongjong and Cheongna, it is part of the Incheon Free Economic Zone. The need for new, sustainable cities is rising as the world's population continues to grow. Songdo International Business District in South Korea is a prime example of a new city that brings together the world's best technologies, building design and eco-friendly practices to create the ultimate lifestyle and work experience. The Songdo International Business District will feature the Northeast Asia Trade Tower and the Incheon Tower. Schools, hospitals, apartments, office buildings and cultural amenities are to be built in the district. Replicas of architectural hallmarks, including New York City's Central Park and Venice's waterways, will also be incorporated. This 10-year development project is estimated to cost in excess of $40 billion, making it one of the most expensive development projects ever undertaken.