Completed in 1973, the original World Trade Center complex was dubbed a "dream come true" by Governor Nelson Rockefeller at the official ribbon cutting ceremony on April 4.
After the September 11, 2011 terrorist attacks left a hole in New York's skyline, ideas started spewing about what and how to rebuild.
Years later, One World Trade stands in its place. It's not just the Western Hemisphere's tallest building — it has also become a symbol of American pride.
See how the original World Trace Center evolved into today's Freedom Tower after the attacks of 9/11.
SEE ALSO: 17 One World Observatory Instagram shots that will take your breath away
Construction on the original towers began in February 1967 with less than a $500 million budget. Architect Minoru Yamasaki designed two 110-story tall towers that were to be constructed as hollow structures supported by steel columns.
Source: New York State Education Department, History.com
The Port Authority and New Jersey Engineering Department aided in the complex's construction. Over 10,000 workers were involved in the building of the complex, which included both towers and a five-acre outdoor plaza with a 25-foot-tall Fritz Koenig sculpture.
Source: New York State Education Department, History.com
There were 43,600 windows in the twin towers and over 600,000 square feet of glass. Each building accommodated 50,000 workers and around 200,000 daily visitors.
Source: New York State Education Department, History.com
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