So named for marking the point where the shipping lanes of the St. Lawrence Seaway cross into Canadian waters, Crossover Island is home to a historic lighthouse that dates to April 1847, when it was built to guide ships away from a dangerous nearby shoal. The following year, a home was built for the lighthouse keeper, along with a boathouse and smokehouse. All of these structures—save for the original lighthouse, which was replaced with a sturdier version in 1882—survive to this day. The current owner, an ardent preservationist, applied for landmark designation and in 2007 it was named a National Historic Landmark. Now the private island and its historic cluster of buildings are for sale, asking $540K.
· Crossover Island [Coldwell Banker]