THEN AND NOW: How New York City's World Trade Center has changed in the 15 years since the 9/11 terrorist attack

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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.