![]() At 1,377 feet above street level, the outdoor viewing platform was the highest in the world when it opened in December 1975. The South Tower Observation Deck was composed of an indoor observatory on the 107th floor of the South Tower and an outdoor viewing platform atop the tower’s roof. New York City used this landfill to help build Battery Park City, a neighborhood directly west of the World Trade Center. As a result, the site’s foundations, including those of the Twin Towers, had to extend down to bedrock about 70 feet below street level.ĭuring construction, workers removed more than one million cubic yards of soil and rock from the site. The World Trade Center was built entirely on landfill. More than 425,000 cubic yards of concrete were required to construct the World Trade Center, enough to pave a sidewalk from New York City to Washington, D.C.Īt least seven foundries supplied more than 200,000 tons of structural steel for the construction of the World Trade Center-more steel than was used to build the Verrazzano-Narrows Bridge, the longest suspension bridge in the United States, that connects Staten Island to Brooklyn, New York. The North Tower was completed first in December 1970, followed by the South Tower in July 1971. The Twin Towers began their vertical climb in 1968. Construction on the World Trade Center began on August 5, 1966, but most of the work in the first two years was below street level. ![]()
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