UPDATE 7/28/16: Thanks to commenters T313, Rudolph, and Andre Woola, we now know! It's Entrelacement, a public art work by Michel de Broin. You can see it on Google Street View here. Go team Neatoramanauts!
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Bartek Komorowski, an urban planner and biking enthusiast, posted this photo of what he says is a stretch of pathway near the Charlevoix Bridge over the Lachine Canal in Montreal. It's not for the novice rider.
Is this real? I can't find any supporting information about this section of the path, but Komorowski doesn't seem inclined to tweeting Photoshop gags.
-via Jeremy Barker