The interior design of this New England seaside escape—by decorating legend Nina Campbell—explores a myriad of themes: the evolution of a home, the importance of place, and the creation of an oasis amid a bustling world. The interiors of this glorious retreat's many buildings are given the Nina Campbell treatment with vibrant palettes, sumptuous fabrics, fine antiques, and a contemporary clarity. Constructed at the turn of the last century, the core of the main house is a simple cottage overlooking a secluded cove. The pioneering couple who built it had no idea that they were creating a legacy that would become central to the lives of future generations of their family, who use the place as a retreat from busy lives in the city. The main house evolved from that summer cottage to a larger Federal-style manse—whose recent reinvention was overseen by New York architects Ferguson & Shamamian—in a landscape with outlets for indoor and outdoor bliss. Campbell is familiar with creating backdrops for entertaining—she had previously designed Annabel’s, the renowned private members’ club in London. With a dedicated party villa, bowling alley, pool house, and tennis pavilion as well as accommodations for family and friends, the property established itself as a place for fun and relaxation. Under the spreading branches of the tree that offered shade to the original house and garden, the place has become an oasis of peace and calm away from the din of the outside world.