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In 2013, a devastating explosion rocked the Boston Marathon, and experts suggest a lack of security and surveillance allowed two brothers to carry out the terror attack undetected.
Survivors, academics and former public officials dissect the timeline of the Iranian hostage crisis, occupation of the U.S. Embassy in Tehran and failed rescue mission Operation Eagle Claw.
Insufficient planning, defiant tourists and months of ignored warnings lead to chaos in May 1980 when Washington's Mt. St. Helens devastates the surrounding area with a lateral eruption.