After some brooding about the latest 365 prompt, I realized that I have at least one photo in the ready pile that answers it.
We have a lot of buildings around here with the characteristic 'doghouse' on the top - old and decrepit ones, new and spiffy ones, big ones, tiny ones. In Eastern Ontario a building with a doghouse on the roof is a sugar shack or sugar camp, a building used to boil down maple sap until it becomes syrup. The 'doghouse' has removable sides and when the sap is boiling, the excess steam escapes through it, making the main part of the building less steamy and improving visibility.
087/365 - idiomatic - an old sugar camp on Concession 2.