Gettysburg: In the Footsteps of Mathew Brady 1 of 9 Timothy O'Sullivan / Library of Congress 1863: The gatehouse of Evergreen Cemetery The gatehouse of Evergreen Cemetery, a private facility that gave Cemetery Ridge its name, is one of the most striking original buildings still standing on the battlefield. It was near this spot that General Winfield Scott Hancock began to rally the Union troops who were retreating through the town of Gettysburg on July 1, and where the Union "fishhook" line began to form. To mark the 150th anniversary of the battle of Gettysburg, TIME has published a richly illustrated 192-page book, Gettysburg: Turning Point of the Civil War. To buy a copy, go to time.com/gettysburgbook