Drones light up NYC sky to honor lives lost on 9/11

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In a powerful tribute, thousands of drones illuminated lower Manhattan to form the images of the Twin Towers -- one light for each person lost on the day of the September 11th attacks. David Muir shares how the breathtaking drone show came together in collaboration with members of the 9/11 community.

ABC News Chief Investigative Correspondent Aaron Katersky reports on the ongoing health challenges faced by Sept. 11 first responders and details the security measures in place at Ground Zero.

A quarter of a century after the horrific terror attack on Sept. 11, 2001, Americans' grief remains, but hope endures – and so does the promise: never forget. David Muir reports on the day that forever changed America and the world.

SO EINEN KRASSEN RAUM haben wir in einem Lost Place noch nie gesehen!

HIER wohnt seit Jahrzehnten niemand mehr! Lost Place Erkundung