Bloodstained shoes worn by Linda Lopez as she evacuated from the 97th Floor of Tower 2 on September 11, 2001 are seen in this photograph before becoming a part of the National September 11 Memorial & Museum in New York August 22, 2011. Lopez was at work at the Fiduciary Trust Company on the 97th floor of the World Trade Center's South Tower when the first plane crashed into the North Tower, sending a fireball past their window and radiating a heat that she said felt like being sunburned. There was quickly a sense of confusion: was it a bomb? Were the rumors that it was a plane crash true? Should people in the South Tower ignore the advice coming over the public address system to stay put and evacuate instead? Lopez felt she had to get out. She had reached only as far as the 61st when she was thrown against a wall as the second plane crashed into the floors above her. Taking off her shoes, she continued to head down the stairs, passing firefighters heading in the opposite direction. She ran barefoot out of the building, across broken glass and other debris. "Lady, your feet are bleeding," someone said to her as she paused a few blocks away in relative safety. She put her shoes back on, and began learning the details of what it was she had just escaped from. REUTERS/Lucas Jackson (UNITED STATES - Tags: ANNIVERSARY SOCIETY)