The Lyman Estate, formerly known as “The Vale,” is a country estate in Waltham, originally established in 1793 by Boston merchant Theodore Lyman. The Estate’s grand Federal-style mansion was completed in 1798 and was designed by the Salem architect, Samuel McIntire. The mansion remained in the Lyman family as a summer home for the next century-and-a-half. Lydia Lyman Paine, daughter of nineteenth century owner George Lyman, married Robert Treat Paine, who built Stonehurst on a neighboring estate. The Lyman family added an upper story to their house in 1882. The estate, now owned by Historic New England, is known for its greenhouses (the earliest of which dates to 1800), which are open to the public.