Fort Boonesborough was a frontier fort in Kentucky, founded by Daniel Boone and his men following their crossing of the Kentucky River on April 1, 1775. The settlement they founded, known as Boonesborough, Kentucky, is Kentucky's second oldest European-American settlement. It served as a major frontier outpost during the American Revolutionary War, and survived into the early 19th century before its eventual abandonment. A National Historic Landmark now administered as part of Fort Boonesborough State Park, the site is one of the best-preserved archaeological sites of early westward expansion by British colonists in that period. It is located in Madison County, Kentucky off Kentucky Route 627.