TOP 10 US MEGASTRUCTURES

BUILT BY ARCHITECT company Skidmore , Owings and Merrill in the 1970s to accommodate retail giants Sears Roebuck and Company , the concrete and steel high rise building now dominates the Chicago skyline at 110 storeys and has become one of the top 10 tallest megastructures in the world at *** Constructed at a cost of over $ 175 billion , the tower has over 16,000 large windows to enable maximum light to enter the building , creating a light and airy space for over 12,000 occupants and 25,000 daily visitors , in addition to polished granite flooring incorporated throughout . In the 1980s , two television antennas were factored into the tower ’ s design , which are now home to local broadcasting and radio stations . Also , incorporated at the tower is a Skydeck , which has become one of the top tourist attractions in Chicago , enabling tourists to see across three different states at 1,353ft . Through extensive renovation work in 2009 , the Skydeck now includes ‘ the Ledge ’ on the 103rd floor , enabling tourists to view the skyline through glass boxes which extend from the build . Now owned by Blackstone Group , the Willis Tower incorporates several sustainable features , with reduced energy and water consumption per year , in addition to reducing the annual electricity consumption by over 30 percent through sophisticated lighting systems . they reach the top height of 456ft , “ riders descend 418ft back down to Earth in a 270 degree spiral .”

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