The White House has functioned as a Presidential residence, Executive Office and national command center. Now, experts give an inside look at the secret protocols, elite security and hidden history of the world's most public of private residences.

Fort Knox is one of the most secure structures in the world and synonymous with gold. Experts unlock the secret contents, political controversy and cutting-edge security behind the world's most famous vault.

The Playboy Mansion is America's most infamous address, a place where fantasies true. Experts go inside the stately residence to reveal the secret places, decadent gatherings and special indulgences reserved for beautiful women and Hollywood's elite.

They are the most advanced and heavily protected vehicles ever built -- operated by technicians prepared for the worst. But behind the the bulletproof glass and armor plating of the US President's fleet of vehicles are secrets.

The FBI is America's most powerful police force, and while its mission is public knowledge, its tactics are classified. Experts go undercover to reveal the secret training, special operations and state-of-the-art tools used in today's crime fighting.

West Point is the most prestigious military academy in the world, but inside this launch pad for the US Army's elite are secrets. Experts go inside West Point to uncover the complex selection process, secret rituals and special training.

The Pentagon is the epicenter of America's military operations. But behind the concrete walls are secrets. Experts explore the complex operations and top-secret business conducted at the largest low-rise office building in the world.