Brisbane Open House is a Doors Open Days event held in Brisbane, Queensland, Australia that showcases many of the city's buildings to the public. Among the buildings included are historical landmarks, galleries, office buildings, museums, places of worship and bridges. Well known buildings not usually open to the public are open for free public tours. The annual event is usually held on the first weekend in October. The event is organised by the Queensland Government Architect, the Brisbane Development Association, and the National Trust of Queensland.