St. Augustine, Florida is the oldest continuously inhabited European settlement in the continental United States, founded by the Spanish in 1565. It has changed hands between Spain, Britain, and the United States over the centuries due to various treaties and wars. In the late 19th century, it became a winter resort destination under industrialist Henry Flagler. Some of St. Augustine's most notable historical sites include the Castillo de San Marcos fort, Fort Mose settlement as the first legal free black community in America, and the oldest schoolhouse in the United States.