The SIS Building, also commonly known as the MI6 Building, is the headquarters of the British Secret Intelligence Service (otherwise known as 'MI6'). It is known within the intelligence community as Legoland and also as 'Babylon-on-Thames' due to its resemblance to an ancient Babylonian ziggurat. It is located at 85, Albert Embankment in the south western part of central London, on the bank of the River Thames  (Photo by In Pictures Ltd./Corbis via Getty Images)