There once was a hidden city that didn't appear on any maps. The people that lived there were sworn to secrecy about every aspect of their lives and work. Even if they wanted to tell someone about what was going on they couldn't have. The vast majority of the men and women working in Oak Ridge, TN didn't have any idea of what they were working on.This was completely engrossing! The patriotism that led these people to move to the middle of nowhere to work on a secret something was awe inspiring to read about. What an amazing hidden bit of history.