Mayor Jim Watson announced this year's Doors Open Ottawa event Monday at the Cartier Square Drill Hall.
For a weekend, 130 significant buildings in the city will be open to the public for free including embassies, museums, and historical buildings.
Watson says normally off-limits buildings like ambassadors residents and the Britannia Water Purification Plant will be open to the public.
"There's really quite an eclectic list of different buildings that you can go and see," Watson said.
For the first time the Children's Hospital of Eastern Ontario will be participating as part of its 40th birthday, according to Alex Munter, the hospital's president and CEO.
Munter says their Doors Open weekend will feature what he calls a "Human Library."
"We'll have interesting people, experts in their field, even somebody who was one of CHEO's first patients in 1974 there to talk about their story and their experiences," he said.
This year's Doors Open Ottawa takes place June 7 and 8.