1.8M views · 13K reactions | It's known as "the hardest test in history." Civil War buffs spend years studying - sometimes even decades - to become licensed Gettysburg guides, but the test has a nearly 90% failure rate. Brook Silva-Braga goes inside what it takes to become a guide and follows the latest group of hopefuls as they prepare and find out if they made the cut. | CBS Mornings | Facebook

6.4K views · 402 reactions | The Gettysburg battlefield was one of the most extensively photographed landscapes in history at the time of the Civil War. Join American Battlefield Trust Chief Historian Garry Adelman, as he walks you through the then and now of locating some of the most famous photographs of the battle. | American Battlefield Trust | Facebook