Rare opportunity in the Hadlyme section of East Haddam featuring two dwellings on one parcel set in a scenic, natural setting. The main circa 1780 Mill House offers approximately 1,786 sq ft with original hardwood floors, chestnut paneling, two second-floor bedrooms, two additional attic rooms, and a first-floor suite with fireplace and private entrance overlooking a historic spring-fed pond. Central air, oil heat, and recent hot water heater. The second dwelling is the thoughtfully restored Grace Chapel (circa 1901), now a modern ADU featuring an open layout with one bedroom, one and a half baths, full kitchen, mudroom, and stackable washer/dryer. Upgrades include energy-efficient windows and doors, spray foam insulation, ducted air-source heat pump, new roof, shake siding, poured concrete basement, and upgraded septic. Property borders Hungerford Brook and abuts approximately 250 acres of conservation land. Additional features include a historic post-and-beam barn, shed, electrified chicken coop, invisible pet fence, and security cameras. Conveniently located near the Hadlyme Ferry, Gillette Castle, Devil's Hopyard State Park, Fox Hopyard Golf Course, and the Goodspeed Opera House. Ideal for multigenerational living, guest use, or income potential.