Seventy years ago the Army created a secret city as part of the effort to create an atomic bomb to end World War II.
That Secret City is Oak Ridge.
Now visitors have a way to explore its history with the help of a pocket sized guide.
Standing in front of the Midtown Community Center, Martin McBride explained the building's history. "It was built in 1945. It is vintage Manhattan Project. It was a recreation center during the Manhattan Project."