Perched along the pristine shores of Prospect Harbor with commanding views of the iconic Prospect Harbor Lighthouse, this extraordinary waterfront property captures the essence of luxury coastal living in Downeast Maine. Offering approximately 5,300± sq ft, the residence features 4 bedrooms, 2 full baths, and 2 half baths, blending historic character with refined modern comfort. Originally built in 1900 and meticulously maintained and enhanced over the years, the home showcases timeless New England architecture, rich hardwood floors, custom millwork, and a striking stone fireplace. Sun-drenched interiors are framed by sweeping harbor views, creating a warm yet sophisticated atmosphere throughout. At the heart of the home, the spacious chef's kitchen is designed for both everyday living and entertaining, featuring premium appliances, abundant cabinetry, and seamless flow into gathering spaces. The third-floor primary suite serves as a private sanctuary, complete with vaulted ceilings and breathtaking panoramic views of the harbor, its vibrant working waterfront, and out to the open ocean. Additional guest accommodations and flexible living areas provide ample space for family and visitors, while a two-tier home theater enhances year-round enjoyment. An expansive covered porch invites you to savor spectacular sunrises and watch lobster boats glide across the harbor. A stately office, heated 3-car garage, and additional finished room above the garage complete the expansive living spaces. The included waterfront parcel boasts approximately 570± feet of shoreline, including the only beach in the harbor suitable for launching a boat. Deep-water access supports a seasonal dock and mooring, with ideal conditions for boating, kayaking, and paddleboarding. Ideally located along the Schoodic National Scenic Byway near Acadia National Park, this rare offering combines natural beauty, maritime heritage, and exceptional coastal living.