The Historic SDG Jail is a fascinating heritage site located in downtown Cornwall. Once the jail for the United Counties of Stormont, Dundas and Glengarry, the building offers visitors a rare look inside a former correctional facility that operated for more than a century. Today, it serves as a museum and historic attraction where guests can explore preserved cells, corridors, exercise yards, and exhibits connected to justice, punishment, and daily life behind bars.
The jail is known for its atmospheric setting and powerful stories. Visitors can learn about former inmates, guards, court procedures, and the conditions people experienced while confined there. The building includes original architectural features that help bring its history to life, from heavy doors and narrow cells to spaces once used for work, supervision, and discipline.
Guided tours are a major part of the experience, offering historical context and personal stories that make the site engaging and memorable. The jail also has a darker history, including executions that took place on the property, making it an especially interesting stop for people drawn to legal history, local heritage, and unusual museums.
Located near Cornwall’s waterfront, downtown shops, restaurants, and other cultural attractions, the Historic SDG Jail can easily be included in a day of exploring the city. Overall, it provides a compelling and educational glimpse into eastern Ontario’s past, preserving the stories of the people who lived, worked, and were confined within its walls.
Attractions