A section of "impact steel" from the World Trade Center is on display outside the footprint of the South Tower inside the National September 11 Memorial Museum.  Photo 8 of 14 in At Ground Zero Bedrock, the 9/11 Museum Prepares for Visitors

At Ground Zero Bedrock, the 9/11 Museum Prepares for Visitors8/14

A section of "impact steel" from the World Trade Center is on display outside the footprint of the South Tower inside the National September 11 Memorial Museum.

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