The Archives of Ontario is the largest provincial archives in Canada, with a vast collection that includes paper items, photographs, maps, architectural drawings and audio, video and film recordings. Located at York University's Keele Campus, this purpose-built facility includes a reading room with digital microfilm readers, audio and video booths, digitization and conservation labs, an exhibit gallery and a classroom.

Celebrate the York Regional Forest at this innovative building that creates more energy than it uses. Functioning as the hub for York Region Forestry’s educational programming, this centre was built using local and recycled materials. In 2018, the building became the first LEED Platinum-certified building in Canada. During Doors Open, visit the displays and take a tour of the facility.

Step into the Cotton Factory, a vibrant creative hub in lower Hamilton and a stunning adaptive reuse of the 1900 Imperial Cotton Company. Home to artists, artisans, and creative professionals, it offers open studios, galleries, pop-up markets, and versatile event spaces. Discover dramatic Gothic industrial architecture, original details, and a rare, fully operational 1944 Otis Fensom freight elevator.

Originally home to Knox College, this building later served as a military hospital and laboratory. It is now the University of Toronto’s John H. Daniels Faculty of Architecture, Landscape and Design. To create the faculty's new home, the restored historical building has been blended with a contemporary addition that continues to delight visitors. During Doors Open, take a self-guided tour.

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.

Families and children of all ages are welcome to come spend some time in the forest! You will tour the interior and exterior spaces of the award winning Forest Explorers building, and a short walk away is the Ottawa Forest and Nature School area. Take part in a tour, story walk and step inside a yurt!

Opened in 2005, the 9,290-square-metre (100,000-square-foot) Ottawa Paramedic Service Headquarters is a state-of-the-art facility that houses all paramedic operations (except for medical dispatching), a vehicle depot and administrative area for the service. This was the first LEED-certified building in Ottawa. Each day, more than 75 emergency vehicles are deployed to serve the communities of the nation’s capital.

Built in 1914 as a silent-picture theatre, this three-storey building has been revitalized into an environmentally sustainable hub that offers accessible programming and arts initiatives centred around marginalized BIPOC communities. Retaining the building's original heritage and charm, the restoration highlights exposed brick and wooden posts. Featured in this green building is a restaurant, rooftop garden, co-working areas and galleries/event spaces.

In 2025, the Toronto and Region Conservation Authority unveiled their new head office, bringing together cutting-edge sustainability design and practice. One of North America’s most sustainable buildings, it boasts low greenhouse gas emissions. Look for the beautiful cascading water walls and the naturally lit atrium. See how green building design in an urban landscape can integrate with the natural environment.

Turner Fleischer is a multidisciplinary design studio providing architecture, interior design and graphic design services across Canada. The Toronto studio has been their home for 20-plus years. Reimagined in 2020, this former 1970s industrial building was transformed into a contemporary, people-centred workplace. Explore the studio and learn how design shapes our lives. Tours, interactive demonstrations and a Lego construction zone.

One of Toronto’s only renewable-energy sites open for public tours, the ZooShare Biogas Plant generates enough renewable energy to power 250 homes and businesses. Each year, they use 15,000 tonnes of inedible food waste and 2,000 tonnes of manure from the Toronto Zoo to create biogas, which is converted into electricity. Learn how biogas contributes to a more sustainable future.