TOP 10 US MEGASTRUCTURES

ALSO KNOWN AS the ‘ Freedom Tower ’, built after the September 11 2011 attacks , the One World Trade Center officially opened in 2014 and became the sixth tallest skyscraper in the world , reaching a total height of 1,776ft .

Designed by architect David Childs from Skidmore , Owings and Merrill in New York , the new construction incorporates several security features to ensure the safety of individuals who utilise the rentable space . The build sits on a 18ft concrete base to support the structure from any potential attack , with a steel outer framework and 3ft thick reinforced concrete walls in all walkways and shaft networks . Tishman

Realty & Construction led the vital construction work , having worked on the original World Trade Center .

The layout of the building is complex with exterior glass facades , yet the edges at the base are chamfered , transforming the tower so that the centre has become octagonal . The observation deck , located over 100 floors above ground and several eateries have turned the build into a firstclass mixed use building for both businesses and visitors to the area .

Similar to many modern constructions , the build has become increasingly sustainable , with over 80 percent of its waste products which are now recycled . Many internal structural elements have also been built from recycled materials .

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