. >> monica iken: it is... sacred and hallowed space. >> stahl: we spoke with four family members who are also members of the museum's board. paula grant berry's husband david worked in tower 2, as did monica iken's husband, michael. anthoula katsimatides' brother john was in tower 1; and tom rogeÉr's daughter jean was a flight attendant on american airlines flight 11. >> paula grant berry: the site radiates something for us all in a very special way. >> monica iken: that's where the final resting place of our loved ones is. >> stahl: it has to be there? >> monica iken: it has to be there. >> voices: has to be there. >> anthoula katsimatides: yes. >> monica iken: and you can feel it. >> alice greenwald: this is the remnant of the exterior structure that made up the twin towers. >> stahl: one of greenwald's first challenges in this hallowed space was deciding where the story of 9/11 should begin. >> alice greenwald: we begin with the voices of people from around the world, remembering where they were when they h