Discover hidden histories and untold stories during Doors Open Rideau Lakes on Saturday, August 16 and Sunday, August 17, 2025! In coordination with the Ontario Heritage Trust, sites of historical, cultural and natural significance will be open with free admission throughout the township. From a former jail to a stunning mansion, and from a working heritage mill to private tours of a national scientific resource, see www.rideaulakes.ca/doorsopen for more and plan to attend!