The Dominion Observatory Campus consists of several scientific buildings used for astronomy, seismology, gravity and geo-magnetism. In 1904, the first building was constructed to house the retractable telescope. In 1905, a transit house was added to the western wing for the meridian circle telescope and transit instruments that were used to determine time, longitude and star positions.

Western’s Don Wright Faculty of Music welcomes over 20,000 community members each year for concerts, outreach programming and special events. Join Doors Open London for guided tours of performance, rehearsal and research spaces and watch the renowned New Horizons Band rehearse, one of the largest programs of its kind in North America.

This picturesque church was founded as a congregation of the Free Church of Scotland in 1853. The present building site was offered to the congregation by mill operator Mr. Ferrie, and the church became the spiritual home of Scottish settlers of the historic village of Doon. The 1853 building is still in use today (with an extension) and retains many original features.

During Doors Open, visitors to DTAH will experience the history of a beautifully renovated modern building in the heart of downtown Toronto. This leading landscape architecture, architecture and urban design firm will offer tours where you can learn how DTAH continues to shape the city through projects like the Tommy Thompson Park Pavilion, Evergreen Brick Works and Artscape Wychwood Barns.

Opened in 1956, the Dundas Museum & Archives is a private, non-profit museum that collects, interprets and celebrates the unique identity of the Valley Town. As part of Doors Open Hamilton, they welcome the public to tour its permanent galleries. As well, you can visit the historical circa 1848 Doctor's Office and the 1873 Pirie House.

Explore Dundurn Castle, an Italianate villa built in the 1830s on Burlington Heights, once home to Sir Allan Napier MacNab, Premier of the United Canadas and his family and household staff. Enjoy a self-guided tour of the Castle, listen to traditional music performed by harpist Ruth Sutherland and don’t forget to explore the grounds, including Dundurn’s beautiful Historic Kitchen Garden.

Built in 1924, Richmond Hill High School is now home to École secondaire Norval‑Morrisseau. Expanded in 1951, 1960 and 2011, the building began as an eight‑classroom replacement for the original Yonge and Wright school, reinforcing Richmond Hill’s role in regional education. Guided English and French tours highlight the school’s history, Francophone culture, and its connection to artist Norval Morrisseau.

Welcome to edstudiO — where imagination meets transformation in the journey to reshape the future of education. It is a space for innovative educators and education researchers. Play, collaboration and interaction are central to the edstudiO experience, where the focus is on learning through playful engagement with state-of-the-art digital tools and physical materials.

Celebrating its 78th anniversary this year, the legendary El Mocambo has seen some of the world’s top musical acts — including Ronnie Hawkins, Stevie Ray Vaughan and The Rolling Stones. It has become a world-class production and entertainment facility. Come and take a tour of the most legendary music venue in North America!

London's oldest residence, Eldon House, has been virtually unchanged since the 19th century, showcasing family heirlooms and treasures of the Harris Family across four generations. In 2026, Eldon House invites reflection on how lives have evolved alongside London. Visitors may take part in self-guided tours of the house and grounds and enjoy classic Victorian lawn games.

Uncover the traditions and symbolism of Freemasonry, and how it has been involved in the life of this community for 150 years. See historical furnishings and symbols in the lodge room, browse heritage displays, chat with Freemasons from Glenrose Lodge No 628 (est. 1924) and sister Lodge, New Dominion Lodge No. 205 (est. 1868), who moved to Elmira in 2020.

Built in 1896, the gothic style building was dubbed Birkett’s Castle. The “Castle” has served as the Japanese Embassy and as headquarters of different organizations, such as the Canadian Boy Scouts Association and the Heritage Canada Foundation. In 1994 the Hungarian Government bought the building and since then it has been serving as the Residence of the Ambassador.

In 1866, Mother Marie of the Order of Our Lady of Charity came to Ottawa to conduct mission work in a building on this site. By 1877, a spacious new monastery building was constructed, which was further expanded in 1895. Following a devastating 1938 fire, the monastery was rebuilt. In 1972, the Chinese government purchased it as Chinese Embassy’s chancery. Pre-registration required, opening TBD.

Since the late 1940s, this building has housed three embassies — the Uruguayan Embassy, the Embassy of the Hungarian People’s Republic, and the current one. In 1995, the mansion was purchased and donated to the Republic of Armenia by a prominent Armenian-American businessman and philanthropist. Each year, they welcome hundreds of visitors interested in architecture and Armenian history.

This environmental show-house demonstrates how to achieve a 70 to 80 per cent reduction in climate emissions through small but significant changes to the building enclosure, heating, cooling and ventilation systems. Visitors will tour the house to see how the owners also improved windows, doors, appliances and lighting to achieve these reductions.

This environmental show-house demonstrates how to achieve a 70 to 80 percent reduction in climate emissions through small but significant changes to the building enclosure, heating, cooling and ventilation systems. Visitors will tour the house to see how the owners also improved windows, doors, appliances and lighting to achieve these reductions.

Enriched Bread Artists is a not-for-profit collective of visual artists working in a range of media and techniques. It was formed in 1992 by graduates of the University of Ottawa looking for studio space and an artistic community beyond university. Today, its membership is global. The name refers to the former bread factory where these studios are located.

The Erland Lee (Museum) Home is a National Historic Site that serves to tell three stories: that of the Lee family (who lived in the home from 1808-1970), the Stoney Creek community and the Women's Institute (which was founded in the home's dining room in February 1897). The Lee Home is a beautiful example of carpenter's Gothic architecture.

The Ermatinger Old Stone House is one of the oldest stone buildings northwest of Toronto. Charles Ermatinger and his wife Mananowe (Charlotte) ran their home and business here during the fur trade era. It has served many purposes over the years — hotel, sheriff's residence, courthouse and apartments. Restored from 1967-70, the building is now a historical site and museum.

Estonian Museum Canada presents its home, Tartu College, as part of Doors Open Toronto 2025. Built in 1970, the college is known mostly as a student residence. But, for local Estonians, it is one of their most important cultural community centres, featuring diverse and lively programs. Their collection has grown into what is now the largest Estonian-themed collection outside Estonia.

Evergreen is a national non-profit organization transforming public spaces to build a healthier future for people and our planet. The Evergreen Brick Works is an example. Once a brick factory, it was transformed into a showcase of green design, and a community hub. Don’t miss the popular Farmers’ Market on Saturday. Free shuttlebus from Broadview Station! Arrive early.

Constructed in 1880, this building was Niagara's first telephone exchange. In 2015, it was transformed into a brewery but retains some of its original features. Original hemlock floor joists became the second-floor bar and tabletops. Some nods to the building's use as a telephone exchange include brewing numbers (instead of names) and a tasting board shaped like a rotary dial.

Stop by these three exterior-only sites to read information provided for Doors Open visitors:
Kennedy Terrace (791 2nd Avenue West): one of Owen Sound’s best-preserved examples of Victorian residential terraces. 
Thomson Beverages - Pepsi Manufacturing Facility (1701 3rd Avenue East): a mid-20th century soda bottling facility.
The Owen Sound Cenotaph (815 1st Avenue West): dedicated in 1920, serving as a memorial to all Canadian veterans. 

In 2023, the University of Ottawa inaugurated the Faculty of Health Sciences building, a state-of-the-art facility with modern architecture, designed to empower the next generation of health-care providers, professionals and researchers to build healthier, more resilient communities. Overlooking the Rideau River and surrounded by green spaces, this unique facility incorporates Indigenous design elements. The University of Ottawa welcomes the public discover this facility. 

Come and explore this house’s magnificent architecture. Built in 1793, Fairfield House preserves the building skills of the Loyalist settlers. It offers one of the best-preserved late-18th-century buildings in Ontario. During Doors Open, learn about the Fairfield family and early Loyalist settlers. And witness how settlement began here with just tents, basic rations and tools from the Crown.