(Idaho)
Massacre Rocks State Park is a history-focused public recreation area in the Northwest United States featuring the Massacre Rocks, a famous spot along the Oregon Trail and California Trail during the middle 19th century. The state park is located along the Snake River, ten miles (16 km) southwest of American Falls, in Power County, Idaho. (Ref: https://en.wikipedia.org/wiki/Massacre_Rocks_State_Park)