Built in 1976, the Aultsville Theatre is a 680-seat non-profit professional theatre that hosts a variety of events annually. Come and experience theatre life on the other side of the curtain. Take a backstage tour and see where the performers prepare themselves. Get a behind-the-scenes look at the theatrical lighting, rigging and operations that bring productions and performances to life.

For the first time since taking possession of the Bishop's House in 2026, Glengarry Fencibles Trust can host guests with accessibility needs. Please note that because of the front lawn's rolling topography/stone retaining wall, the lift is accessed via the 4739 Frog Hollow Road entrance. There, guests will also find parking and a veranda that opens to the central hallway.

The Carman House Museum — a Georgian-era limestone cottage — was built circa 1815. The family was part of the Loyalist migration after the American Revolutionary War, receiving a land grant for their service to the Crown. It is also one of only two original buildings in Iroquois that were not moved for the 1950s construction of the St. Lawrence Seaway.

Built in 1854, Cline House remained in the Cline family until 1955 when the Cornwall Library Board took possession. This fine Regency-style building is characterized by a low hip roof and central entrance. One of Cornwall's finest homes, Cline House was once the location of the Simon Fraser Centennial Library. Today, it is a thriving art gallery.

The Cornwall Armoury, home of the Stormont, Dundas and Glengarry Highlanders, is a historic military building completed in 1938. Designed in a Scottish Baronial style, it features a striking stone-and-brick façade concealing one of Canada’s largest drill halls. The armoury serves as a training centre, regimental headquarters and symbol of the region’s proud military heritage.

This museum collects, preserves and displays historical artifacts related to Cornwall and the United Counties of Stormont, Dundas and Glengarry. Their exhibit spaces host a multitude of artifacts organized by theme — the founding of New Johnstown and the Royal Townships, a turn-of-the-century kitchen, industry, law, commerce, textile, community service, health care and more. Come and explore this fascinating museum!

This 6-kilometre (3.7-mile) self-guided walking tour is a voyage into Cornwall’s heritage, depicting events and points of interest from the city’s past. The tour follows nearly 30 plaques that have been erected along Cornwall’s waterfront, downtown and in parts of Le Village in the city’s east end — representing industrial links, the former Cornwall Canal and the founding of New Johnstown.

This designated library sits on a former orphanage site that was then acquired by the federal government to house a post office in 1953. In 1997, after the post office had moved to another location and following extensive renovations, the library moved into this building, making it Cornwall's downtown jewel. Guided tours only. Registration required (9:45 a.m. and 2 p.m.).

The Battle of Crysler’s Farm Battlefield Memorial Building was built to commemorate the battle that took place on November 11, 1813, as part of the War of 1812. Located at the bottom of a hill created with soil from the original battlefield, visitors will find the building full of artifacts, murals, and dioramas detailing the battle between British and American forces.

The Iroquois Marina sits along the St. Lawrence River at the site of the historical Galop Canal. The canal system was dug in 1844, and the original lock was opened in 1847. The lock was decommissioned in the late 1950s in preparation for the flooding of the Seaway. Today, our marina sits on these historical canal walls.

Glengarry County has a wealth of Celtic heritage. The Glengarry Celtic Music Hall of Fame, founded in 2003, honours individuals and groups who have contributed to the maintenance of the Celtic music culture in the county, including musicians and promotors. In addition to the recognition of the inductees, they also collect memorabilia relevant to the area’s music and culture.

This Georgian-style building dates back to 1862. In 1967, it became a museum dedicated to depicting the story of Sir John Johnson and other Loyalists who settled in the area during the American Revolution. Special exhibits celebrate the bicentennial of the Williamstown Fair (the oldest agrarian fair in Canada) and the War of 1812.

Opened in 1962, the Glengarry Pioneer Museum has grown to include eight heritage buildings, including the Star Inn, a stagecoach stop in the 1860s. Its barroom is thought to be one of the oldest in Eastern Ontario. Other pioneer buildings on this site are the blacksmith shop, town hall, Orange Lodge, log barns, drive shed and cheese factory.

The Heritage Centre, originally the Winchester Township Town Hall, served as a courthouse, drill hall, movie theatre, firehall and many other things. The Chesterville and District Historical Society took over the building in 1984 and has been collecting artifacts and researching local history since. The building is now maintained by the Township of North Dundas.

This jail has a rich history. It served as a maximum-security facility for nearly a century, housing some infamous criminals. It was notorious for its harsh conditions and alleged human rights violations. Today, the jail stands as a museum and popular tourist attraction, offering visitors a glimpse into the prison's past and the harsh realities of life behind bars.

The site is operated by the Ontario East British Home Child Family in collaboration with the Parks of the St. Lawrence. It houses artifacts and displays telling the story of the British Home children in Canada. 

This site comprises 10 heritage buildings that were moved here by members of The Lost Villages Historical Society when the St. Lawrence Seaway was developed in 1958. Casualties of progress, the villages and hamlets disappeared under water but are remembered by former residents. The interiors and exteriors have been restored, and the buildings have been assembled in a village-like setting.

The Paroisse de la Nativité-de-la-Bienheureuse-Vierge-Marie was the early nucleus of Cornwall's Francophone community and has been a dominant feature of Cornwall's skyline for over a century. The beautiful structure was designed and supervised by the second pastor of the parish, Father Paul-Antoine de Saunhac, a native of Toulouse, France. The first mass was celebrated here on Christmas Day 1891.

Located in a beautifully restored 1902 section of the historic grist mill, the Priest's Mill Arts Centre celebrates local art and heritage. Originally built in 1819 and rebuilt after several fires, the mill remains a landmark. During Doors Open, explore the "On Guard for Thee…" exhibit and a fascinating display of Chalet Glass from Cornwall's renowned glassmaking history this year.

Located along the St. Lawrence River, Ontario Power Generation's (OPG's) Saunders Hydro Dam Visitor Centre showcases the history of the St. Lawrence Seaway and Power Project as well as the communities and people affected. Come explore our exciting, informative and interactive displays that make our visitor centre a key tourist destination in the Cornwall area.

Along the Raisin River lies one of the oldest homes in Ontario. This Georgian-style house was built for Sir John Johnson (a soldier, Loyalist and public servant) between 1784-92. This site was chosen because it is a natural location for water-powered mills. The house is now a National Historic Site, dedicated to preserving local history through archives and tours.

This Catholic church was built in 1829. The spire is 54 metres high (176 feet) and is visible from downtown Cornwall. The grounds to the east of the church were the first burial grounds of the parish. Today, it is known as the old cemetery, marked by the calvary scene sculpture composed of the headstones collected from the early cemetery.

This church — complete with belfry and three bells — is an architectural gem. It was built on the McLennan Estate in 1898. Surrounded by parkland, it is commonly known as "The Church in the Wildwood." It is part of the Area Parish of the St. Lawrence, along with Christ Church Seaway in Long Sault and Trinity Church in Cornwall.

The congregation has its roots tracing back to the earliest settlements in Eastern Ontario, with connections to John Bethune. First worshiping in a log structure, they then moved to a larger clapboard one. This third church, built in 1889 (architect S.A. Badgley), features Romanesque Revival architecture and is known for its many beautiful stained-glass windows.

In 1970, a fire consumed the church of St. Raphael’s, one of the earliest Roman Catholic churches in English-speaking Canada. Fortunately, the outer walls were spared and today its impressive scale and fine masonry work continue to attract tourists to the site. The ruins were declared a National Historic Site in 1999.