Curators at the 9/11 Memorial Museum set to open next year at the former World Trade Center site must walk a fine line in presenting the grislier details of the 2001 terrorist attacks, says Reuters.

Some of the more potentially disturbing displays, such as photos of people plummeting from the burning towers or a recording of a flight-attendant’s voice just before she died, will be placed in special alcoves away from the main exhibition, with warnings as to their content so museumgoers will not be confronted by them unawares.

“We’re not here to traumatize our visitors,” said Alice Greenwald, director of the museum slated to open on Sept. 11, 2012. But she added, with regard to the pictures of falling victims, “It is one of the aspects of the 9/11 story that if you didn’t include it, you’re not telling the story.”