nps.gov

BgmBr TIL Death Valley, the lowest elevation in the USA, continues to sink lower due to geologic activity
j67Zn TIL Of the 4,776 Union soldiers buried at Antietam National Cemetery, approximately 1,836, or 38%, are unknown, with their graves marked by small square stones. Antietam was the bloodiest single day in American history with 22,700 casualties.
78mW7 TIL The Bloodiest Single Day in the US History was the Battle of Antietam in the Civil War