Eagle Island is an island in Maine's Casco Bay and the site of the retirement home of the polar explorer Admiral Robert Peary . The island and home have been preserved as a Maine state historic site. Peary bought the island in 1881 and retired there in 1911, after he had achieved fame and glory with his expedition to the North Pole. His family continued to live in the house until the property was donated to the people of Maine in 1967. Eagle Island was listed on the National Register of Historic Places in 1971 and declared a National Historic Landmark in 2014.