Man jumps into World Trade Center Memorial pool

'Very rare' news footage from 9/11 shows close-up of second plane hitting tower in sobering clip

'Will never forget the sound of bodies smashing on ground' — 9/11 survivor, 19 years later

Footage of bodies of those who jumped/fell from the WTC during 9/11. Before the Towers collapsed, an estimated 200 people fell to their deaths from the burning towers, at a speed of almost 150 mph—sufficient to cause instant death, but insufficient to cause unconsciousness during the fall (GRAPHIC)

Timelapse of One World Trade Center's construction