The fourth plane hijacked on September 11, United Airlines Flight 93, left Newark International Airport at 8:42 a.m. At 10:06 a.m., the plane crashed in rural southwestern Pennsylvania, killing everyone on board but sparing what officials believe was another intended target in Washington, D.C.

Soon afterward, the crash site near Shanksville, Pennsylvania, became a shrine. People traveled for miles to pay their respects to the heroes of Flight 93. Many felt compelled to leave something behind. Thousands of memorial offerings have been left at the site since September 2001.