Henri Christophe, a Haitian revolutionary, instructed the construction of the Citadelle Laferrière, widely known as the Citadelle or the Citadel, in Nord. It lies 17 miles south of Cap-Haïtien and 8 miles uphill from the town of Milot. The fortress was built by tens of thousands of former slaves, and was meant to be a form of defense against French invasion. Along with several other forts, the Citadelle is the only African-derived military fortification in the New World and the first of its type. The UNESCO World Heritage Site, along with Sans-Souci Palace, is a symbol of Haiti and is highly regarded.