Bodies at the Dunker Church in Antietam, Maryland, September 1862. The battle of Antietam was the bloodiest single-day battle in US history, and Dunker Church was the focus of Union attacks against the Confederates. In 1921, a storm destroyed the church, but it was rebuilt for the 100th anniversary of the battle in 1962. Archive photograph by Alexander Gardner/Library of Congress
Interactive project provides a “then and now” look at key war locations.