Welcome to one of Northern Westchester's most architecturally unique and energy-efficient homes plus a newly added accessory apt suite--tucked away on a peaceful two-acre setting in Waccabuc. This thoughtfully expanded 4-bedroom, 3-bathroom geodesic dome combines striking design with everyday comfort and function. Soaring ceilings and distinctive triangular windows flood the home with natural light and showcase the stunning surroundings in every season. The entry way opens up to a dramatic two-story great room, custom-built-ins with a rolling library ladder. The spacious, updated kitchen offers generous counter seating and modern finishes and seamless flow to a large outdoor deck--perfect for entertaining or enjoying quiet moments in nature. The first floor finishes with the first-floor primary bedroom suite with primary bathroom and closets, a powder room, and den. Upstairs find three spacious bedrooms with closets and a hall bath. The lower level connects to the 3-car garage. The expanded footprint includes a separate accessory apartment/guest suite with its own private entrance, kitchen w/living space, full bath, and bedroom. Easy access to the train station (just 5 minutes away), and only 50 miles to NYC, this home is both a peaceful escape.