 In a 2010 "GQ" magazine article about the coolest small cities in America, visiting the Diamond Cove General Store to get a lobster roll made their list of four must-see places in Portland.Diamond Cove was initially an artistic retreat community, hosting visitors such as Henry Wadsworth Longfellow and Harriet Beecher Stowe, and it included amenities including a nine-hole golf course.At the time of the Spanish–American War, the island was converted almost entirely to a military base to defend Casco Bay.