A reflective 104-story skyscraper known as One World Trade Center is rising amid New York City’s skyline where the iconic Twin Towers of the World Trace Center once stood.

The building—which became New York’s tallest in April—sits adjacent to the site of the towers that were destroyed in a terrorist attack 11 years ago today, on September 11, 2001. The exact footprints of the Twin Towers have been memorialized by two reflecting pools with cascading waterfalls, and walls inscribed with the names of those who were lost in the attacks.

The photographs featured above were taken by members of the crew building the new World Trade Center, which is expected to be completed in late 2013.

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