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Doors Open Ontario:

Cornwall and SDG Counties

in-person event information

Saturday and Sunday, August 16 and 17, 2025, from 10 a.m. to 4 p.m.

Cornwall and SDG Counties are partnering again this year to bring you a memorable Doors Open experience. This annual event offers an incredible opportunity to visit some of the region’s most fascinating historical, cultural and architectural sites. From heritage landmarks and museums to modern marvels, each location tells a unique story about the region’s rich history and vibrant community. Whether you're a history buff, an architecture enthusiast, or simply looking for a family-friendly adventure, Doors Open Cornwall and SDG Counties is your gateway to discovery.

Note: Some sites' hours may differ. Please refer to each site's page for hours of operation for Doors Open 2025.

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Community info

In the farthest reaches of Eastern Ontario, you’ll find Cornwall and SDG Counties. From the mid-sized city of Cornwall to the most picturesque villages — such as Williamsburg in the west and Williamstown in the east — there is a timeless appeal here.

Cornwall Historic Walking Tour
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.

From heritage buildings peppering the landscape and wondrous waterways that beckon boats, fishing rods and swimsuits, to endless swaths of forests to explore on foot, bike, snowshoes and skis — these all serve as the beautiful, year-round backdrop for amenities, activities and adventures. Discover restaurants, wineries, breweries, beaches, boutiques, bass tournaments, bed-and-breakfasts and accommodations, music and theatre venues, cyclotourism routes, county fairs, lavender-picking farms, campgrounds . . . and more!

Bishop's House
A historical building in the Glengarry County village of St. Raphael’s. The 1808 stone house was built as the home of Rev. Alexander Macdonell, a major figure in early Ontario history, parish priest of St. Raphael’s from 1804 to 1815 and later the first bishop of Ontario. The Bishop’s House is across the road from the celebrated St. Raphael’s Ruins, a National Historic Site.

To learn more about all that there is to see and do here, explore these Doors Open sites or visit Cornwall Tourism and SDG Tourism.

Long Sault Parkway
The Long Sault Parkway, located in the St. Lawrence River between Long Sault and Ingleside, is a perfect detour to take en route to local historical sites and museums, such as the Lost Villages Museum, or the Battle of Crysler's Farm. You can even cycle the dedicated Waterfront Trail, that will take you all the way east through Cornwall, and west to Iroquois.

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Contact information

Phone: 613-360-4746
Email: chagen@sdgcounties.ca
Website: https://whereontariobegan.ca/contact

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1 In-person Doors Open site

Historic SDG JailDoors Open Cornwall and SDG Counties

  • In-person Doors Open Ontario

Historic SDG Jail

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.

  • Guided tours available
  • Kid-friendly
  • Parking
  • Self-guided tours available
  • Washrooms
  • Photography allowed
  • Rental opportunities

Contact info

11 Water Street West
Cornwall, Ontario
Email: tourism@sdgcounties.ca
https://www.historicsdgjail.com

Architecture

Year built: 1833
Building type: Attraction Historical landmark

Dates/hours open

Aug 16 - Aug 17