We don't usually post on-set photos from Supernatural (or any television show), because they're usually just candid shots of actors. But sometimes people snap something cool - something spoilery - and they're definitely worth a post.
We've got two sets of photos for you below, gathered from two fan sources (salsa-babe on LiveJournal and shay_loves_hayden at IMDB). The shots featuring the building are from salsa-babe. She thinks they're from episode 6.03 (or thereabouts, which would make sense with the filming timeline) and described a bit about what she saw:
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