23. Antietam National Battlefield (Maryland)
Antietam National Battlefield marks the site of the bloodiest single-day battle in American history, fought in 1862. Its peaceful fields and meticulously preserved monuments draw history enthusiasts and those seeking to honor the memory of those who served. Much like Valley Forge or Manassas, Antietam offers a poignant setting to reflect on the costs of war and the profound events that shaped the course of the nation.
