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The floors are streaked in blood and the walls pockmarked with bullet holes. Many children trying to flee were shot in the doorways of their classrooms; their bodies piled up, preventing others from escaping.

NBC News' Wajahat S. Khan was part of the first U.S. television crew to film inside the Peshawar school where Taliban militants killed more than 140 people — mostly children — during a siege.

Alongside the neat rows of chairs in the auditorium, the aisles are streaked with pools of blood and the marks of small, bloody footprints.

Brightly-colored bulletin-boards decorated with flowers — a familiar sight in any school — hang high on the walls, leading into a conference room with its doors shot through.

In a courtyard, homework, notebooks, papers and children's backpacks are scattered across the ground. "Teacher of the Year Awards" were laid out, alongside bloodstained clothing.

Classrooms were destroyed — bullets have ripped chunks out of the walls and explosions have burned the floor. Somehow though, a Pakistani flag remains untouched amid the destruction on one teacher's desk.