There is some controversy about Islam followers building something there right now but i wanted not to focus on that and remember those that lost their lives that day.
Watching some of the footage from that days events i saw the look on the Firemen faces as they were looking up at both towers on fire and the despair on there faces as they carried a hose probably thinking 'how are we going to fight that?'. Just as everyone was running away they were heading in to rescue people. Many of them never came out.
Also there is a hotel at the bottom of the two towers a Marriott that got 80% flattened. I didn't know about that building. Approx 40 people lost their lives in that hotel.