Saint John Carleton Martello Tower National Historic Site -Planned during the war of 1812, served as a detention centre for deserters during the First World War -Serviced its final military duty during WWII as a fire command post for the city of Saint John -Circular stone fort defended Saint John and its harbor for some 130 years, and is one of only sixteen such towers built in Canada -offers a panoramic view of the city of Saint John, its harbor and the Bay of Fundy