911 Memorials 

The Twin Towers were the centerpieces of the World Trade Center complex. At 110 stories each, 1 WTC (North Tower) and 2 WTC (South Tower) provided nearly 10-million-square feet of office space for about 35,000 people and 430 companies. They were the tallest buildings in New York City, and for a brief period upon their completion, they were the tallest buildings in the world. They attracted roughly 70,000 tourists and commuters every day.

The North Tower rose 1,368 feet – 1,730 feet with a large antenna – and the South Tower stood 1,362-feet high. Each weighed more than 250,000 tons, contained 99 elevators and had 21,800 windows.

I feel bad for these people who gave up their life. For those who lost a family member , those people didn't deserve that. It is very emotional to hear about this that happened , the innocent people who died for no reason.