See rarely seen photos of the Pentagon from Sept. 11

First responders arrive at the Pentagon just minutes after American Airlines Flight 77 crashed in Washington, DC on September 11, 2001. (FBI Files)
First responders fly the American flag at the Pentagon following the September 11 terror attacks. (FBI Files)
Smoke rises from the Pentagon following the crash of American Airlines Flight 77 on September 11, 2001. (FBI Files)
Debris from American Airlines Flight 77 in the hours following the September 11 attacks. (FBI Files)
FBI investigators inspect the Pentagon following the attacks on September 11, 2001. (FBI Files)
An overhead view of the Pentagon showing the damages caused by the September 11th attacks. (FBI Files)
A photo of the damage done to the Pentagon's outer ring caused by the September 11th terror attacks. (FBI Files)
First responders attempt to put out fires at the Pentagon following the September 11th attacks. (FBI Files)
This FBI photo shows the damage done to the inner rings of the Pentagon following the September 11, 2001 attack. (FBI Files)
FBI investigators inspect the Pentagon following the attacks on September 11, 2001. (FBI Files)
FBI investigators inspect the Pentagon following the attacks on September 11, 2001. (FBI Files)
FBI investigators inspect the Pentagon following the attacks on September 11, 2001. (FBI Files)
FBI investigators inspect the Pentagon following the attacks on September 11, 2001. (FBI Files)
Debris remains at the Pentagon in the hours following the September 11 terror attacks. (FBI Files)
FBI investigators inspect the Pentagon following the attacks on September 11, 2001. (FBI Files)
FBI investigators inspect the Pentagon following the attacks on September 11, 2001. (FBI Files)
Photos show the damage to the interior ring of the Pentagon following the September 11 terror attacks. (FBI Files)
An overhead view of the Pentagon showing the damages caused by the September 11th attacks. (FBI Files)
Debris from American Airlines Flight 77 in the hours following the September 11 attacks. (FBI Files)
Debris remains at the Pentagon in the hours following the September 11 terror attacks. (FBI Files)
Debris from American Airlines Flight 77 in the hours following the September 11 attacks. (FBI Files)
Debris remains at the Pentagon in the hours following the September 11 terror attacks. (FBI Files)
Debris remains at the Pentagon in the hours following the September 11 terror attacks. (FBI Files)
First responders attempt to put out fires at the Pentagon following the September 11th attacks. (FBI Files)