The 9/11 Memorial held its' Grand Opening September 11, 2011. For the first time, I went with my family to see the completed project. It consists of 2 giant water falls, each flowing into a reflective pool. And each one lies in the foot print of where the North and South towers once stood.
The Museum is still under construction, but there is a small visitor's center with artifacts from the wreckage. This particular display touched me the most.
The 2 waterfalls and reflective pools lie at the base of the One World Trade Center that is currently under construction (notice the people below for scale).