Did Not Know

Per the Gear Junkie

"Unbeknownst to many American mountaineers, the highest point of elevation east of the Rocky Mountains is not in New Hampshire. That title belongs to Harney Peak in South Dakota, a 7,242-foot stone-topped summit that towers over the pine and granite of the Black Elk Wilderness area west of Rapid City.

Indeed, you have to cross the Atlantic Ocean to find a taller peak, as Harney is the highest point between the Rocky Mountains and the French Pyrenees."