Established 1834, still in use. Under private ownership.
"The Brattleboro Retreat, a 1000-acre comprehensive mental health treatment center founded in 1834, consists of 58 buildings and sites, 38 of which are contributing historic structures that date from 1838 to 1938. The complex encompasses large-scaled brick buildings for patient accommodations and therapy, ancillary cottages, residences, spring house, tower, and farm buildings, all set in a scenic environment of landscaped grounds, open meadows, woods, and fields. Building styles range from Federal, Greek Revival, Italianate, and Colonial Revival to suburban residential."
Photo and descriptive paragraph © Robert B. Stephenson, from Conn River Historic Sites Database
The Brattleboro Retreat its own web site. as well.