First FDNY chief to enter World Trade Center on 9/11 recalls seeing brother for last time

The teachers' heroic actions saved 28 young lives.

On the 25th anniversary of 9/11, ABC News’ Robin Roberts sat down with the last survivor pulled from the rubble of the World Trade Center. Genelle Guzman-McMillan recounts the moments she spent trapped beneath the debris — and how she continued living afterwards.

Joseph Pfeifer was the first New York City fire chief to respond to the World Trade Center attacks on 9/11, together with a team that included his own brother. Tony Dokoupil shares his story.

The Twin Towers underperformed as office buildings and stunk as architecture. But no one who knew them will ever forget them. Millions of New Yorkers -- and millions upon millions of Americans -- miss their iconic, double thumbs-up thrust into the sky.