America's Book of Secrets: Special

A glimpse inside the maximum-security world of America's secret prisons as we unveil their hidden agendas and covert operations.

Recent discoveries of previously unknown hominids and breakthroughs in genetic technology give Bigfoot believers new hope that the creature will be found; asking if America is prepared for doomsday; America's only unsolved airplane hijacking.

For some Americans, home is not behind a picket fence because it is behind steel bars, reinforced concrete, and even armed guards.