Outside a gated subdivision of mansions in McLean, a line of cars idles every weekday morning as a new day in Top Secret America gets underway. The drivers wait patiently to turn left, then crawl up a hill and around a bend to a destination that is not on any public map and not announced by any street sign.
tries hard to hide from view. But in the winter, leafless trees can't conceal a mountain of cement and windows the size of five Wal-Mart stores stacked on top of one another rising behind a grassy berm. One step too close without the right badge, and men in black jump out of nowhere, guns at the ready.
Past the armed guards and the hydraulic steel barriers, at least 1,700 federal employees and 1,200 private contractors work at Liberty Crossing, the nickname for the two headquarters of the Office of the Director of National Intelligence and its National Counterterrorism Center. The two share a police force, a canine unit and thousands of parking spaces.
Liberty Crossing is at the center of the collection of U.S. government agencies and corporate contractors that mushroomed after the 2001 attacks. But it is not nearly the biggest, the most costly or even the most secretive part of the 9/11 enterprise.