Purgatory Chasm State Reservation is a protected state park in Sutton, Massachusetts. Located within Blackstone Valley, the reservation is managed by the Massachusetts Department of Conservation and Recreation. History Previously owned by the Whitin Machine Works, Purgatory Chasm was declared a state park in 1919. The reservation is notable for its , chasm of granite bedrock with abrupt precipices and caves. Various theories have been proposed to account for the creation of the chasm. According to one source, it was created when glacial meltwater ripped out bedrock at the end of the last Ice Age. Purgatory Chasm is open to the public, although the chasm is closed to hikers during the winter season because of icy hazards. There are of hiking trails, and rock climbing is allowed by permit. The reservation also includes picnic areas, a visitor center, and a playground. In popular culture A 1992 episode of Rescue 911 concerned events at Purgatory Chasm. Scenes from the 2015 film The Sea of Trees were filmed at Purgatory Chasm. Gallery References External links Official website Protected areas established in 1919 State parks of Massachusetts Landforms of Worcester County, Massachusetts Rock formations of Massachusetts Parks in Worcester County, Massachusetts Sutton, Massachusetts