9/11 — 10 Years Later

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A woman walks on the ground of the Pentagon Memorial in Arlington, Va., on June 28, 2011.

(Alex Wong/Getty Images)

A woman walks on the ground of the Pentagon Memorial in Arlington, Va., on June 28, 2011.

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History of U.S. Bombings, Failed Attempts

A look at some of the worst bombings in the U.S. and infamous failed attempts.

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