Doors Open is the most rare of Toronto events: widely anticipated, universally loved, well attended, and free. Every year, tens of thousands of locals and tourists (and more than a few Torontoist Flickr Poolers) lace up their walking shoes and descend on the participating sites, learning about architecture and history while exploring rarely seen parts of the city. And with 175 buildings on the slate this year, there's lots for everyone to enjoy. But it's impossible to look at the full list of venues and not wonder about the buildings that don't appear. Maybe they've never taken part or maybe they're simply taking this weekend off. Either way, here are a few of the sites we'll miss this year.
