The July issue of The Throwback, my monthly history-themed e-newsletter, takes a look back at the secret plan to save the Declaration of Independence from destruction during World War II. It may sound like a plot line from a National Treasure movie, but it’s a true story. Plus, did you know there is a secret chamber behind Abraham Lincoln’s brow on Mount Rushmore that was built to house the Declaration of Independence and other precious documents? Click here to find out more.