Take a look back at the origins of and history behind the customary salute to the American flag.

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Before a new president takes office, he receives briefings on secret intelligence vital to national security.

Six days a week, the president receives a daily briefing about international security issues including covert operations underway around the world.

Experts theorize that there are hundreds of secure locations around the U.S. that could serve as a presidential bunker in the event of a natural catastrophe.

The top secret "nuclear football" accompanies the president at all times.

The presidential intelligence center was established by President Kennedy during the Cold War and updated in 2007 with top of the line technology.