MAY 29 & 30 Step out into the street and discover some very interesting buildings as part of Doors Open Toronto, an annual celebration of the city’s architectural excellence. This free event offers visitors access to 150 unique modern and longstanding structures—including Old City Hall, St. James Cathedral and the reopened City Hall Podium Green Roof—each with their own historical, cultural, architectural and even environmental stories. Some locations offer tours, interpretive materials and activities to augment your visitor experience. And don’t forget to bring your camera—some of these sites are not open to the public at any other time of the year. Various venues and times; call 416-338-0628 or click here for further details.