From Breakfast Benedicts to our signature Twin Lobster Dinner special, The Porthole provides a classic Northeast diner experience in Portland, Maine. The Porthole has operated in the heart of the Old Port on the working waterfront since 1929. A longtime favorite amongst locals and tourists alike, the large deck space makes way for outdoor dining, live music, and dancing in the summer months. Visiting in the winter? Music performances continue every Saturday in our indoor event space, which holds 100+ people. The Porthole is open year-round, 7 days a week.