The Codman House is operated by Historic New England, which is the oldest and largest regional heritage organization in the nation, and is located along the Lincoln Byway Loop.
The Estate is an outstanding example of a country estate laid out in the English manner. The house is sited on a knoll with a commanding view. The park-like setting includes a ha-ha wall, specimen trees, and plantings. An Italianate garden, hidden in a dell behind the house, dates from the turn of the century. A rose garden near the carriage house, redesigned by Dorothy Codman in 1908, once held more than 250 plant species.