For some Americans, home lies not behind a picket fence, but behind steel bars, reinforced concrete, and even armed guards. What is it like to live within these residential fortresses... and what secrets are being protected within them?

From Masonic symbols to concealed bases and hidden tunnels that exist right under our feet, are many of America's best kept secrets hiding in plain sight?

As technology advances, information about everything--and everyone--is becoming more accessible than ever before. Every action is monitored, every conversation recorded, and every secret at risk of being exposed. But in this age of unlimited access, who is collecting our information? And what are they using it for?

Every day, ordinary Americans are lured away from their normal lives by cults, drugs, and criminal organizations. But what causes a person to make such a radical change, even going so far as commit acts of terrorism... or take part in a mass suicide?