The Polish Combatants' Association Branch 20, a non-profit organization founded in 1948, is dedicated to honouring the memory of Polish veterans and promoting Polish history, culture and language. The three-storey building includes an underground parking lot, offices, a dining room, banquet hall and military museum. The building has a rich history and holds great meaning for the Polish-Canadian community.

The Potter's Studio, established in 1972, has been a major contributor to the ceramic community in Toronto with workshops and classes. It recently relocated to this Scarborough location. Come and visit the large, bright, airy studio and experience the potting process — from wheel throwing and hand-building to glazing and firing pots. Warning: Some visitors may find this craft addictive.

Join a local resident for a guided walking tour of the Power Glen Valley, starting outside Decew Generating Station #1 and ending at the 1855 home of Benjamin Reynolds – the oldest home in the Power Glen Heritage District. The hike is approximately 45 minutes, followed by a 45-minute discussion of the house exterior and heritage printery. Pre-registration is required.

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.

The Public Works Big Wheels Expo offers kids of all ages an exciting chance to get a closer look at the trucks and equipment behind the city’s public works. Come and explore some of the city’s mightiest machines. Meet the fleet and climb into the driver’s seat — from garbage trucks and snowplows to sidewalk sweepers and road painting trucks.

Celebrating 20 years, Q4 Architects is the largest woman-owned and -led architectural firm in Canada. They are focused on designing residential and mixed-use projects with a sense of dignity, at all levels of affordability. This studio is perched above the West Don River, with sweeping views of the ravine. Come and explore the studio's boardrooms, creative studio and collaboration spaces.

The historical industrial building that stands here today once housed the Hamilton Gear and Machine Company from 1911-94 (who manufactured the St. Lawrence Seaway lock actuators and the Rogers Centre roof mechanisms). Today, the space has been revitalized into a vibrant recreational hub. Visit this transformed space to experience a unique blend of Toronto’s industrial heritage with its new facilities.

Founded in 1858, the Queen's Inn is Stratford's oldest continuously operating hotel, rebuilt in the neoclassical style in 1905. Long a gathering place at the heart of community life — even hosting Queen Elizabeth II during her 1959 visit — the hotel is now being restored/transformed into a Marriott Tribute Portfolio property known as the Queen’s Cue, continuing its tradition of hospitality.

Welcome to Quest Art School + Gallery, located inside the Midland Cultural Centre in downtown Midland. Quest is a not-for-profit organization that has fostered and celebrated visual arts creativity in Georgian Bay for over 30 years. Quest is a unique space that has a significant connection to the community and is recognized for its active programming and events! 

Quinte Family History Research Centre, located in St. Matthew's Church, offers visitors genealogical resources from across Hastings and Prince Edward Counties, and beyond. The amazing volunteers are on hand to assist with research requests or help with your family tree. The centre holds over 500 family tree files, local history resources, cemetery, census, birth, marriage and death records and collections.

Constructed in the 1930s, this popular Doors Open site is Toronto’s largest water treatment plant, providing 400 million litres of safe drinking water daily. It’s also the largest ensemble of art deco structures in the city. Take a self-guided tour and explore the pump house and filter building, with staff available to answer questions along the way. (No tripods/filming allowed.) (Photo: Samuel Kolber)

The Ravine Vineyard Estate Winery is a timeless Niagara destination for award-winning wines and world-class farm-to-table cuisine. It is steeped in history, family legacy and agricultural heritage. Situated in the heart of St. Davids, this charming and historical property offers a unique escape from the everyday hustle and bustle while being conveniently located only minutes from the Queen Elizabeth Way.

This former Imperial Bank of Canada branch has stood for over 100 years; it was one of Toronto’s oldest remaining bank buildings. Today, it is being painstakingly restored as the headquarters for the management training firm Raw Signal Group. During Doors Open, the main-floor banking hall will be open, showing the original terrazzo flooring and the still-operating 1960s bank vault.

RCLUB is reinventing the car club. Located in midtown Toronto, this clubhouse is more than just a social club. Members visit to catch up with friends, connect with clients, work on or wash their cars, or hit the virtual track on top-notch driving simulators. While the love of cars is shared, the incredible community is what makes RCLUB special.

Redpath Sugar began in Canada in 1854 and has been operating in Toronto since 1959. As one of the last industrial establishments in the Toronto Harbour, Redpath remains a vital part of the community. Explore the site, engage with employees, interact with historical artifacts and enjoy a treat or two along the way. Entrance will be through the Centre Gate.

The Regent Theatre was constructed in 1919, and its King Street façade features symmetrical Georgian architectural lines. It stands as one of the few remaining examples of this classically inspired architectural style in Oshawa. Originally built for Famous Players theatres, it was closed for several years before being reopened in 2010 as a lecture theatre for Ontario Tech University.

Join us to experience a site where architecture, history and international perspectives unite to form a true community gathering space. Regis College (which comprises Christie Mansion and Fontbonne Hall) is part of the University of Toronto’s Faculty of Theology. During Doors Open, explore the ornate and well-preserved Victorian architecture, as well as speak with staff and watch a multimedia presentation.

Restoration Design Inc. is a manufacturing facility specializing in rust repair and replacement panels for vintage Porche automobiles.  The company produces many of its parts in-house and also supplies used original panels and other components for restoration projects. Visitors will learn about the specialized tools, machines and processes involved.

We are pleased to welcome visitors to Rhythm Automotive Canada to explore the history of its facilities. Tours begin in Plant #2 (1954), featuring machining of in-house forged components, then continue through an underground tunnel beneath Louth Street to Plant #1, ‘The Forge’ (1929), where steering linkages and ball joints are produced for international clients.

In 1805, the original property was sold to Captain Fulton (Loyalist and first justice of the peace in the area). Richard Vanderburgh later purchased the property and built the Georgian-style house while married to Fulton’s daughter, Elizabeth. Now home to the Richmond Hill Board of Trade, it fosters local business growth. Guided tours highlight its architecture, exhibits, and the heritage garden.

The Richland Academy is displaying artwork from award-winning artist and art teacher Josephine Sherman. Guests are invited to explore watercolour paintings that portray the beauty of our landscapes, wilderness and evocative florals with an emphasis on the interplay of light and colour.

The Richmond Hill Artifact Collections Storage Centre houses thousands of historical artifacts in its climate-controlled facility. Much of the collection — generously donated by local families — dates back over a century. Take a behind-the-scenes look at the collections and learn how they catalogue, preserve and maintain the artifacts.

Built in 1936 as a post office, this historical gem has been reimagined into a dynamic cultural centre. It offers rentable rooms for artists, cultural organizations and creative professionals. From hands-on studios to soundproof recording rooms and flexible gathering spaces, it is built to support your creative journey. Whether you are looking to create or collaborate, you will find your spark here.

The Richmond Hill David Dunlap Observatory is a national historic site. Opened in 1935, it was at the forefront of Canadian astronomical research, housing the then-largest telescope in Canada. Today, it is a facility for public education and outreach through City-run programs and partnerships. Pre‑registration is required for tours and activities.

The Richmond Hill Heritage Centre is housed in a restored 1840s Regency-style cottage, and was originally home to Amos Wright, the first Reeve of Markham Township. The Centre serves as a unique venue to showcase the rich heritage and history of Richmond Hill. Explore galleries and exhibits, or enjoy their popular afternoon teas (reserve online — limited seating available).