is an annual, free event that invites the public to explore Ottawa's most architecturally and historically significant buildings—many of which are typically closed to the public or charge admission. Launched in 2002, it has grown into one of Canada's largest heritage events, attracting nearly 850,000 visits over the years.
The 2025 edition will take place on June 7 and 8, marking its 23rd anniversary. This year, over 90 buildings across Ottawa will participate, offering a mix of in-person, virtual, and hybrid experiences . Notable sites include the Royal Canadian Mint, the Billings Estate Museum, and, for the first time, the Embassy of the People's Republic of China, which will offer guided tours and cultural performances on Saturday only.
To facilitate exploration, a free shuttle service will operate between various sites from 1…